1.
Burj Khalifa
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The Burj Khalifa, known as the Burj Dubai before its inauguration, is a megatall skyscraper in Dubai, United Arab Emirates. It has a height of 828 m, and with its antenna included, it stands a total height of 829.8 m, making it the tallest building. Construction of the Burj Khalifa began in 2004, with the exterior completed 5 years later in 2009, the primary structure is reinforced concrete. The building was opened in 2010 as part of a new development called Downtown Dubai and it is designed to be the centrepiece of large-scale, mixed-use development. The decision to build the building is based on the governments decision to diversify from an oil-based economy. The building was named in honour of the ruler of Abu Dhabi and president of the United Arab Emirates, Khalifa bin Zayed Al Nahyan, Abu Dhabi, the building broke numerous height records, including its designation as the tallest tower in the world. Burj Khalifa was designed by Adrian Smith, then of Skidmore, Owings & Merrill, whose firm designed the Willis Tower, Hyder Consulting was chosen to be the supervising engineer with NORR Group Consultants International Limited chosen to supervise the architecture of the project. The design is derived from the Islamic architecture of the region, the Y-shaped tripartite floor geometry is designed to optimize residential and hotel space. A buttressed central core and wings are used to support the height of the building, although this design was derived from Tower Palace III, the Burj Khalifa’s central core houses all vertical transportation with the exception of egress stairs within each of the wings. The structure also features a system which is designed to withstand Dubais hot summer temperatures. It contains a total of 57 elevators and 8 escalators, critical reception to Burj Khalifa has been generally positive, and the building has received many awards. However, the issues during construction were controversial, since the building was built primarily by migrant workers from South Asia with several allegations of mistreatment. Poor working conditions are common, as the result of the lack of minimum wage laws in the United Arab Emirates, several instances of suicides have been reported, which is not uncommon for migrant construction workers in Dubai despite safety precautions in place. Construction began on 6 January 2004, with the exterior of the completed on 1 October 2009. The building officially opened on 4 January 2010, and is part of the new 2 km2 development called Downtown Dubai at the First Interchange along Sheikh Zayed Road, near Dubais main business district. The towers architecture and engineering were performed by Skidmore, Owings and Merrill of Chicago, with Adrian Smith as chief architect, the primary contractor was Samsung C&T of South Korea. The towers construction was done by the division of Al Ghurair Investment group. The decision to build Burj Khalifa is reportedly based on the decision to diversify from an oil-based economy to one that is service
2.
Dubai
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Dubai is the largest and most populous city in the United Arab Emirates. It is located on the southeast coast of the Persian Gulf and is the capital of the Emirate of Dubai, Abu Dhabi and Dubai are the only two emirates to have veto power over critical matters of national importance in the countrys legislature. The city of Dubai is located on the northern coastline. Dubai will host World Expo 2020, Dubai has emerged as a global city and business hub of the Middle East. It is also a transport hub for passengers and cargo. By the 1960s, Dubais economy was based on revenues from trade and, to an extent, oil exploration concessions. Oil revenue first started to flow in 1969, Dubais oil revenue helped accelerate the early development of the city, but its reserves are limited and production levels are low, today, less than 5% of the emirates revenue comes from oil. The emirates Western-style model of business drives its economy with the main revenues now coming from tourism, aviation, real estate, Dubai was recently named the best destination for Muslim travellers by Salam Standard. Dubai has recently attracted attention through many innovative large construction projects and sports events. The city has become iconic for its skyscrapers and high-rise buildings, in particular the worlds tallest building, Dubai has been criticised for human rights violations concerning the citys largely South Asian and Filipino workforce. As of 2012, Dubai was the 22nd most expensive city in the world, in 2014, Dubais hotel rooms were rated as the second most expensive in the world, after Geneva. Dubai was rated as one of the best places to live in the Middle East by U. S. global consulting firm Mercer, Many theories have been proposed as to the origin of the word Dubai. One theory suggests the word was used to describe the souq, another theory states that the name came from a word meaning money, as people from Dubai were commonly believed to be rich due to the thriving trading centre of the location. An Arabic proverb says Daba Dubai, meaning They came with a lot of money, according to Fedel Handhal, a scholar on the UAEs history and culture, the word Dubai may have come from the word daba, referring to the slow flow of Dubai Creek inland. The poet and scholar Ahmad Mohammad Obaid traces it to the same word, an inhabitant or native of the city is a Dubaian. Although stone tools have been found at archaeological sites, little is known about the UAEs early inhabitants as only a few settlements have been found. Many ancient towns in the area were trading centres between the Eastern and Western worlds, the remnants of an ancient mangrove swamp, dated at 7000 BC, were discovered during the construction of sewer lines near Dubai Internet City. The area was covered with sand about 5,000 years ago as the coast retreated inland, pre-Islamic ceramics have been found from the 3rd and 4th centuries
3.
United Arab Emirates
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In 2013, the UAEs population was 9.2 million, of which 1.4 million are Emirati citizens and 7.8 million are expatriates. The country is a federation of seven emirates, and was established on 2 December 1971, the constituent emirates are Abu Dhabi, Ajman, Dubai, Fujairah, Ras al-Khaimah, Sharjah and Umm al-Quwain. Each emirate is governed by a monarch, together, they jointly form the Federal Supreme Council. One of the monarchs is selected as the President of the United Arab Emirates, Islam is the official religion of the UAE and Arabic is the official language. The UAEs oil reserves are the seventh-largest in the world while its natural gas reserves are the worlds seventeenth-largest, Sheikh Zayed, ruler of Abu Dhabi and the first President of the UAE, oversaw the development of the Emirates and steered oil revenues into healthcare, education and infrastructure. The UAEs economy is the most diversified in the Gulf Cooperation Council, while its most populous city of Dubai is an important global city, nevertheless, the country remains principally reliant on its export of petroleum and natural gas. The UAE is criticised for its rights record, including the specific interpretations of Sharia used in its legal system. The UAEs rising international profile has led analysts to identify it as a regional. It appears the land of the Emirates has been occupied for thousands of years, there is no proof of contact with the outside world at that stage, although in time it developed with civilisations in Mesopotamia and Iran. This contact persisted and became wide-ranging, probably motivated by trade in copper from the Hajar Mountains, in ancient times, Al Hasa was part of Al Bahreyn and adjoined Greater Oman. Sassanid groups were present on the Batinah coast, in 637, Julfar was an important port that was used as a staging post for the Islamic invasion of the Sassanian Empire. The area of the Al Ain/Buraimi Oasis was known as Tuam and was an important trading post for camel routes between the coast and the Arabian interior. The earliest Christian site in the UAE was first discovered in the 1990s, a monastic complex on what is now known as Sir Bani Yas Island. Thought to be Nestorian and built in 600 AD, the church appears to have been abandoned peacefully in 750 AD and it forms a rare physical link to a legacy of Christianity which is thought to have spread across the peninsula from 50 to 350 AD following trade routes. Certainly, by the 5th century, Oman had a bishop named John – the last bishop of Oman being Etienne, in 676 AD. This led to a group of travelling to Medina, converting to Islam and subsequently driving a successful uprising against the unpopular Sassanids. Following the death of Prophet Muhammad, the new Islamic communities south of the Persian Gulf threatened to disintegrate, with insurrections against the Muslim leaders. The Caliph Abu Bakr sent an army from the capital Medina which completed its reconquest of the territory with the battle of Dibba in which 10,000 lives are thought to have been lost
4.
Setback (architecture)
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A setback, sometimes called step-back, is a step-like recession in a wall. Setbacks were initially used for reasons, but now are often mandated by land use codes. In densely built-up areas, setbacks also help get more daylight, setbacks were used by ancient builders to increase the height of masonry structures by distributing gravity loads produced by the building material such as clay, stone, or brick. This was achieved by reducing the footprint of each level located successively farther from the ground. Setbacks also allowed the natural erosion to occur without compromising the integrity of the building. The most graphic example of a technique is the step pyramids of Mesopotamia and Ancient Egypt. For centuries, setbacks were a necessity for virtually all multi-level load-bearing masonry buildings. As architects learned how to turn setbacks into a feature, most setbacks were however less pronounced than in step pyramids. The introduction of a steel structural system in the late 19th century eliminated the need for structural setbacks. The use of a frame building technology combined with such as elevators and motorized water pumps influenced the physical growth. Driven by the desire to maximize the usable floor area, some developers avoided the use of setbacks, creating in many instances a range of fire safety and it resulted in the 1916 Zoning Resolution, which gave New York Citys skyscrapers their typical setbacks and soaring designs. Today many jurisdictions rely on urban planning regulations, such as zoning ordinances, for example, in high density districts, such as Manhattan in New York, front walls of buildings at the street line may be limited to a specified height or number of stories. Above that height, the buildings are required to set back behind a theoretical inclined plane, called sky exposure plane, in many cities, building setbacks add value to the interior real estate adjacent to the setback by creating usable exterior spaces. These setback terraces are prized for the access they provide to fresh air, skyline views, in addition, setbacks promote fire safety by spacing buildings and their protruding parts away from each other and allow for passage of firefighting apparatus between buildings. In the United States, setback requirements vary among municipalities, the New York City Zoning Ordinance also provided another kind of setback guideline, one that was intended to increase the amount of public space in the city. This was achieved by increasing the minimum setback at street level, creating in each instance an open space, often referred to as plaza, in front of the building
5.
Home Insurance Building
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The Home Insurance Building was a skyscraper in Chicago, generally noted as the first tall building to be supported, both inside and outside, by a fireproof metal frame. The building opened in 1884, and was demolished 47 years later in 1931. It was constructed in 1884 in Chicago, Illinois, and was the first tall building to use steel in its frame. While the Ditherington Flax Mill was an earlier fireproof-metal-framed building, it was five stories tall. Due to the Chicago buildings unique architecture and weight-bearing frame, it is considered the worlds first skyscraper and it had 10 stories and rose to a height of 138 ft In 1890, two additional floors were added. The architect was William Le Baron Jenney, the building weighed only one-third as much as a stone building would have, city officials were so concerned, they halted construction while they investigated its safety. The Home Insurance Building is an example of the Chicago School of Architecture, the building set precedent in skyscraper construction. The exterior was created from brick, the Field Building, later known as the La Salle Bank Building, then the Bank of America Building, and now the Private Bank Building, built in 1931, now stands on the site
6.
Chicago
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Chicago, officially the City of Chicago, is the third-most populous city in the United States. With over 2.7 million residents, it is the most populous city in the state of Illinois, and it is the county seat of Cook County. In 2012, Chicago was listed as a global city by the Globalization and World Cities Research Network. Chicago has the third-largest gross metropolitan product in the United States—about $640 billion according to 2015 estimates, the city has one of the worlds largest and most diversified economies with no single industry employing more than 14% of the workforce. In 2016, Chicago hosted over 54 million domestic and international visitors, landmarks in the city include Millennium Park, Navy Pier, the Magnificent Mile, Art Institute of Chicago, Museum Campus, the Willis Tower, Museum of Science and Industry, and Lincoln Park Zoo. Chicagos culture includes the arts, novels, film, theater, especially improvisational comedy. Chicago also has sports teams in each of the major professional leagues. The city has many nicknames, the best-known being the Windy City, the name Chicago is derived from a French rendering of the Native American word shikaakwa, known to botanists as Allium tricoccum, from the Miami-Illinois language. The first known reference to the site of the current city of Chicago as Checagou was by Robert de LaSalle around 1679 in a memoir, henri Joutel, in his journal of 1688, noted that the wild garlic, called chicagoua, grew abundantly in the area. In the mid-18th century, the area was inhabited by a Native American tribe known as the Potawatomi, the first known non-indigenous permanent settler in Chicago was Jean Baptiste Point du Sable. Du Sable was of African and French descent and arrived in the 1780s and he is commonly known as the Founder of Chicago. In 1803, the United States Army built Fort Dearborn, which was destroyed in 1812 in the Battle of Fort Dearborn, the Ottawa, Ojibwe, and Potawatomi tribes had ceded additional land to the United States in the 1816 Treaty of St. Louis. The Potawatomi were forcibly removed from their land after the Treaty of Chicago in 1833, on August 12,1833, the Town of Chicago was organized with a population of about 200. Within seven years it grew to more than 4,000 people, on June 15,1835, the first public land sales began with Edmund Dick Taylor as U. S. The City of Chicago was incorporated on Saturday, March 4,1837, as the site of the Chicago Portage, the city became an important transportation hub between the eastern and western United States. Chicagos first railway, Galena and Chicago Union Railroad, and the Illinois, the canal allowed steamboats and sailing ships on the Great Lakes to connect to the Mississippi River. A flourishing economy brought residents from rural communities and immigrants from abroad, manufacturing and retail and finance sectors became dominant, influencing the American economy. The Chicago Board of Trade listed the first ever standardized exchange traded forward contracts and these issues also helped propel another Illinoisan, Abraham Lincoln, to the national stage
7.
High-rise building
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A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building or structure used as a residential and/or office building. In some areas it may be referred to as an MDU, in the United States, such a structure is referred to as an apartment building or office building, while a group of such buildings is called an apartment complex or office complex. High-rise buildings became possible with the invention of the elevator and cheaper, the materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most North American style skyscrapers have a frame, while residential blocks are usually constructed of concrete. There is no difference between a tower block and a skyscraper, although a building with fifty or more stories is generally considered a skyscraper. They also pose challenges to firefighters during emergencies in high-rise structures. Studies are often required to ensure that pedestrian wind comfort and wind danger concerns are addressed, in order to allow less wind exposure, to transmit more daylight to the ground and to appear more slender, many high-rises have a design with setbacks. In contrast with low-rise and single-family houses, apartment blocks accommodate more inhabitants per unit of area of land, various bodies have defined high-rise, Emporis Standards defines a high-rise as A multi-story structure between 35–100 meters tall, or a building of unknown height from 12–39 floors. According to the code of Hyderabad, India, a high-rise building is one with four floors or more. The New Shorter Oxford English Dictionary defines a high-rise as a building having many storeys, most building engineers, inspectors, architects and similar professionals define a high-rise as a building that is at least 75 feet tall. The lower floors were occupied by either shops or wealthy families. Surviving Oxyrhynchus Papyri indicate that seven-story buildings even existed in provincial towns, in Arab Egypt, the initial capital city of Fustat housed many high-rise residential buildings, some seven stories tall that could reportedly accommodate hundreds of people. By the 16th century, Cairo also had high-rise apartment buildings where the two floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants. The skyline of many important medieval cities was dominated by large numbers of high-rising urban towers, the residential Towers of Bologna numbered between 80 and 100 at a time, the largest of which still rise to 97.2 m. In Florence, a law of 1251 decreed that all buildings should be reduced to a height of less than 26 m. Even medium-sized towns such as San Gimignano are known to have featured 72 towers up to 51 m in height, the oldest still standing tulou dates back from the 14th century. Tower blocks were built in the Yemeni city of Shibam in the 16th century. The houses of Shibam are all out of mud bricks, but about five hundred of them are tower houses
8.
Curtain wall (architecture)
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A curtain wall system is an outer covering of a building in which the outer walls are non-structural, but merely keep the weather out and the occupants in. As the curtain wall is non-structural it can be made of a lightweight material, when glass is used as the curtain wall, a great advantage is that natural light can penetrate deeper within the building. The curtain wall façade does not carry any dead load weight from the other than its own dead load weight. The wall transfers horizontal wind loads that are incident upon it to the building structure through connections at floors or columns of the building. A curtain wall is designed to resist air and water infiltration, sway induced by wind and seismic forces acting on the building, curtain-wall systems are typically designed with extruded aluminum members, although the first curtain walls were made of steel. The aluminium frame is infilled with glass, which provides an architecturally pleasing building. However, parameters related to solar gain control such as thermal comfort, other common infills include, stone veneer, metal panels, louvres, and operable windows or vents. Buildings were constructed with the walls of the building supporting the load of the entire structure. The exterior walls could be non-load-bearing and thus much lighter and more open than the masonry load-bearing walls of the past and this gave way to increased use of glass as an exterior façade, and the modern-day curtain wall was born. Oriel Chambers and 16 Cook Street, both built in Liverpool, England, by architect and civil engineer Peter Ellis, are characterised by their extensive use of glass in their facades. Towards the courtyards they even boasted metal-framed glass curtain walls, which makes two of the worlds first buildings to include this structural feature. The extensive glass walls allowed light to penetrate further into the building, utilizing more floor space, oriel Chambers comprises 43,000 sq ft set over five floors without an elevator which had only recently been invented and was not yet widespread. An early example of a curtain wall used in the classical style is the Kaufhaus Tietz department store on Leipziger Straße, Berlin. Some of the first curtain walls were made with steel mullions, eventually silicone sealants or glazing tape were substituted, using a glass mullion system. Some designs included a cap to hold the glass in place. The first curtain wall installed in New York City, in the Lever House building, was this type of construction, earlier modernist examples are the Bauhaus in Dessau and the Hallidie Building in San Francisco. During the 1970s began the use of aluminium extrusions for mullions. Aluminum offers the advantage of being able to be easily extruded into nearly any shape required for design
9.
Steel frame
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The development of this technique made the construction of the skyscraper possible. The rolled steel profile or cross section of steel columns takes the shape of the letter I, the two wide flanges of a column are thicker and wider than the flanges on a beam, to better withstand compressive stress in the structure. Square and round tubular sections of steel can also be used, Steel beams are connected to the columns with bolts and threaded fasteners, and historically connected by rivets. The central web of the steel I-beams is often wider than a web to resist the higher bending moments that occur in beams. Wide sheets of steel deck can be used to cover the top of the frame as a form or corrugated mold, below a thick layer of concrete. Another popular alternative is a floor of precast concrete flooring units with some form of concrete topping, the frame needs to be protected from fire because steel softens at high temperature and this can cause the building to partially collapse. In the case of the columns this is usually done by encasing it in form of fire resistant structure such as masonry. The beams may be cased in concrete, plasterboard or sprayed with a coating to insulate it from the heat of the fire or it can be protected by a fire-resistant ceiling construction. Asbestos was a material for fireproofing steel structures up until the early 1970s. The exterior skin of the building is anchored to the using a variety of construction techniques. Bricks, stone, reinforced concrete, architectural glass, sheet metal, the dimension of the room is established with horizontal track that is anchored to the floor and ceiling to outline each room. The vertical studs are arranged in the tracks, usually spaced 16 apart, the typical profiles used in residential construction are the C-shape stud and the U-shaped track, and a variety of other profiles. Framing members are produced in a thickness of 12 to 25 gauge. The wall finish is anchored to the two sides of the stud, which varies from 1-1/4 to 3 thick, and the width of web ranges from 1-5/8 to 14. Rectangular sections are removed from the web to provide access for electrical wiring, Steel mills produce galvanized sheet steel, the base material for the manufacture of cold formed steel profiles. Sheet steel is then roll-formed into the final profiles used for framing, the sheets are zinc coated to prevent oxidation and corrosion. Steel framing provides excellent design flexibility due to the strength to weight ratio of steel, which allows it to span over a long distances. Thermal bridging can be protected against by installing a layer of externally fixed insulation along the steel framing - typically referred to as a thermal break, the spacing between studs is typically 16 inches on center for homes exterior and interior walls depending on designed loading requirements
10.
Reinforced concrete
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The reinforcement is usually, though not necessarily, steel reinforcing bars and is usually embedded passively in the concrete before the concrete sets. Reinforcing schemes are designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Modern reinforced concrete can contain varied reinforcing materials made of steel, Reinforced concrete may also be permanently stressed, so as to improve the behaviour of the final structure under working loads. In the United States, the most common methods of doing this are known as pre-tensioning and post-tensioning, durability in the concrete environment, irrespective of corrosion or sustained stress for example. François Coignet was a French industrialist of the century, a pioneer in the development of structural. Coignet was the first to use iron-reinforced concrete as a technique for constructing building structures, in 1853 Coignet built the first iron reinforced concrete structure, a four story house at 72 rue Charles Michels in the suburbs of Paris. Coignets descriptions of reinforcing concrete suggests that he did not do it for means of adding strength to the concrete, in 1854, English builder William B. Wilkinson reinforced the concrete roof and floors in the two-storey house he was constructing. His positioning of the reinforcement demonstrated that, unlike his predecessors, in 1877, Monier was granted another patent for a more advanced technique of reinforcing concrete columns and girders with iron rods placed in a grid pattern. Though Monier undoubtedly knew reinforcing concrete would improve its inner cohesion, before 1877 the use of concrete construction, though dating back to the Roman Empire and reintroduced in the mid to late 1800s, was not yet a proven scientific technology. His work played a role in the evolution of concrete construction as a proven. Without Hyatts work, more dangerous trial and error methods would have largely depended on for the advancement in the technology. G. A. Wayss was a German civil engineer and a pioneer of the iron, in 1879 Wayss bought the German rights to Moniers patents and in 1884 started the first commercial use for reinforced concrete in his firm Wayss & Freytag. Up until the 1890s Wayss and his firm greatly contributed to the advancement of Moniers system of reinforcing, ernest L. Ransome was an English-born engineer and early innovator of the reinforced concrete techniques in the end of the 19th century. With the knowledge of reinforced concrete developed during the previous 50 years, ransomes key innovation was to twist the reinforcing steel bar improving bonding with the concrete. Gaining increasing fame from his concrete constructed buildings Ransome was able to build two of the first reinforced concrete bridges in North America, one of the first concrete buildings constructed in the United States, was a private home, designed by William Ward in 1871. The home was designed to be fireproof for his wife, one of the first skyscrapers made with reinforced concrete was the 16-storey Ingalls Building in Cincinnati, constructed in 1904. Many different types of structures and components of structures can be built using reinforced concrete including slabs, walls, beams, columns, foundations, frames, Reinforced concrete can be classified as precast or cast-in-place concrete. Designing and implementing the most efficient floor system is key to creating optimal building structures, small changes in the design of a floor system can have significant impact on material costs, construction schedule, ultimate strength, operating costs, occupancy levels and end use of a building
11.
Tube (structure)
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In structural engineering, the tube is a system where, to resist lateral loads, a building is designed to act like a hollow cylinder, cantilevered perpendicular to the ground. This system was introduced by Fazlur Rahman Khan while at the architectural firm Skidmore, Owings & Merrill, the first example of the tube’s use is the 43-story Khan-designed DeWitt-Chestnut Apartment Building, since renamed Plaza on DeWitt, in Chicago, Illinois, finished in 1966. The system can be built using steel, concrete, or composite construction and it can be used for office, apartment, and mixed-use buildings. Most buildings of over 40 stories built since the 1960s are of structural type. The tube system concept is based on the idea that a building can be designed to resist lateral loads by designing it as a hollow cantilever perpendicular to the ground. In the simplest incarnation of the tube, the perimeter of the consists of closely spaced columns that are tied together with deep spandrel beams through moment connections. This assembly of columns and beams forms a frame that amounts to a dense. This exterior framing is designed sufficiently strong to resist all lateral loads on the building, interior columns are comparatively few and located at the core. The distance between the exterior and the frames is spanned with beams or trusses and can be column-free. This maximizes the effectiveness of the tube by transferring some of the gravity loads within the structure to it. By 1963, a new system of framed tubes had appeared in skyscraper design. Closely spaced interconnected exterior columns form the tube, lateral or horizontal loads are supported by the structure as a whole. About half the surface is available for windows. Framed tubes allow fewer interior columns, and so allow more usable floor space, where larger openings like garage doors are needed, the tube frame must be interrupted, with transfer girders used to maintain structural integrity. The first building to apply the tube-frame construction was the DeWitt-Chestnut Apartment Building which Khan designed, from its conception, the tube has been varied to suit different structural needs. This is the simplest incarnation of the tube and it can appear in a variety of floor plan shapes, including square, rectangular, circular, and freeform. The trussed tube, also termed braced tube, is similar to the tube but with comparatively fewer. Steel bracings or concrete walls are introduced along the exterior walls to compensate for the fewer columns by tying them together
12.
Cylinder
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In its simplest form, a cylinder is the surface formed by the points at a fixed distance from a given straight line called the axis of the cylinder. It is one of the most basic curvilinear geometric shapes, commonly the word cylinder is understood to refer to a finite section of a right circular cylinder having a finite height with circular ends perpendicular to the axis as shown in the figure. If the ends are open, it is called an open cylinder, if the ends are closed by flat surfaces it is called a solid cylinder. The formulae for the area and the volume of such a cylinder have been known since deep antiquity. The area of the side is known as the lateral area. An open cylinder does not include either top or bottom elements, the surface area of a closed cylinder is made up the sum of all three components, top, bottom and side. Its surface area is A = 2πr2 + 2πrh = 2πr = πd=L+2B, for a given volume, the closed cylinder with the smallest surface area has h = 2r. Equivalently, for a surface area, the closed cylinder with the largest volume has h = 2r. Cylindric sections are the intersections of cylinders with planes, for a right circular cylinder, there are four possibilities. A plane tangent to the cylinder meets the cylinder in a straight line segment. Moved while parallel to itself, the plane either does not intersect the cylinder or intersects it in two line segments. All other planes intersect the cylinder in an ellipse or, when they are perpendicular to the axis of the cylinder, a cylinder whose cross section is an ellipse, parabola, or hyperbola is called an elliptic cylinder, parabolic cylinder, or hyperbolic cylinder respectively. Elliptic cylinders are also known as cylindroids, but that name is ambiguous, as it can also refer to the Plücker conoid. The volume of a cylinder with height h is V = ∫0 h A d x = ∫0 h π a b d x = π a b ∫0 h d x = π a b h. Even more general than the cylinder is the generalized cylinder. The cylinder is a degenerate quadric because at least one of the coordinates does not appear in the equation, an oblique cylinder has the top and bottom surfaces displaced from one another. There are other unusual types of cylinders. Let the height be h, internal radius r, and external radius R, the volume is given by V = π h
13.
Storey
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A storey or story is any level part of a building that could be used by people. The plurals are storeys and stories respectively, the terms floor, level, or deck can also be used in this sense, except that one may use ground floor and ground level for the floor closer to what is considered the ground or street level. The words storey and floor also generally exclude levels of the building that have no roof, houses commonly have only one or two floors. Buildings are often classified as low-rise, mid-rise and high-rise according to how many levels they contain, the tallest skyscraper in the world, Burj Khalifa, has 163 floors. As of 2013, the tallest planned skyscraper, Sky City, is planned to have 202 floors, the height of each storey is based on the ceiling height of the rooms plus the thickness of the floors between each pane. Generally this is around 10 feet total, however, it varies widely from just under this figure to well over it, storeys within a building need not be all the same height — often the lobby is more spacious, for example. Additionally, higher levels may be smaller in volume than the ones beneath them, in English, the principal floor or main floor of a house is the floor that contains the chief apartments, it is usually the ground floor, or the floor above. In Italy the main floor of a home is usually above the ground level, the attic or loft is a storey just below the buildings roof, its ceiling is often pitched and/or at a different height than that of other floors. A penthouse is an apartment on the topmost storey of a building. A basement is a storey below the main or ground floor, split-level homes have floors that offset from each other by less than the height of a full storey. A mezzanine, in particular, is typically a floor halfway between the floor and the next higher floor. Homes with a split-level entry have the main floor raised half a storey height above the street entrance level. In Macys Herald Square, there is a one and a floor between the first and second, this can be considered a split level floor. There are also car parks, also known as parking garages. Floor numbering is the scheme used for a buildings floors. There are two major schemes in use across the world, in one system, used in the majority of European countries, the ground floor is the floor literally on the ground and often has no number or is assigned the number 0. Therefore, the floor up is assigned the number 1 and is the first floor. The other system, used primarily in the United States and Canada, counts the bottom floor as the first floor, the existence of two incompatible conventions is a common source of confusion in international communication, sometimes even between communities who speak the same language
14.
New York City
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The City of New York, often called New York City or simply New York, is the most populous city in the United States. With an estimated 2015 population of 8,550,405 distributed over an area of about 302.6 square miles. Located at the tip of the state of New York. Home to the headquarters of the United Nations, New York is an important center for international diplomacy and has described as the cultural and financial capital of the world. Situated on one of the worlds largest natural harbors, New York City consists of five boroughs, the five boroughs – Brooklyn, Queens, Manhattan, The Bronx, and Staten Island – were consolidated into a single city in 1898. In 2013, the MSA produced a gross metropolitan product of nearly US$1.39 trillion, in 2012, the CSA generated a GMP of over US$1.55 trillion. NYCs MSA and CSA GDP are higher than all but 11 and 12 countries, New York City traces its origin to its 1624 founding in Lower Manhattan as a trading post by colonists of the Dutch Republic and was named New Amsterdam in 1626. The city and its surroundings came under English control in 1664 and were renamed New York after King Charles II of England granted the lands to his brother, New York served as the capital of the United States from 1785 until 1790. It has been the countrys largest city since 1790, the Statue of Liberty greeted millions of immigrants as they came to the Americas by ship in the late 19th and early 20th centuries and is a symbol of the United States and its democracy. In the 21st century, New York has emerged as a node of creativity and entrepreneurship, social tolerance. Several sources have ranked New York the most photographed city in the world, the names of many of the citys bridges, tapered skyscrapers, and parks are known around the world. Manhattans real estate market is among the most expensive in the world, Manhattans Chinatown incorporates the highest concentration of Chinese people in the Western Hemisphere, with multiple signature Chinatowns developing across the city. Providing continuous 24/7 service, the New York City Subway is one of the most extensive metro systems worldwide, with 472 stations in operation. Over 120 colleges and universities are located in New York City, including Columbia University, New York University, and Rockefeller University, during the Wisconsinan glaciation, the New York City region was situated at the edge of a large ice sheet over 1,000 feet in depth. The ice sheet scraped away large amounts of soil, leaving the bedrock that serves as the foundation for much of New York City today. Later on, movement of the ice sheet would contribute to the separation of what are now Long Island and Staten Island. The first documented visit by a European was in 1524 by Giovanni da Verrazzano, a Florentine explorer in the service of the French crown and he claimed the area for France and named it Nouvelle Angoulême. Heavy ice kept him from further exploration, and he returned to Spain in August and he proceeded to sail up what the Dutch would name the North River, named first by Hudson as the Mauritius after Maurice, Prince of Orange
15.
Philadelphia
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In 1682, William Penn, an English Quaker, founded the city to serve as capital of the Pennsylvania Colony. Philadelphia was one of the capitals in the Revolutionary War. In the 19th century, Philadelphia became an industrial center. It became a destination for African-Americans in the Great Migration. The areas many universities and colleges make Philadelphia a top international study destination, as the city has evolved into an educational, with a gross domestic product of $388 billion, Philadelphia ranks ninth among world cities and fourth in the nation. Philadelphia is the center of activity in Pennsylvania and is home to seven Fortune 1000 companies. The Philadelphia skyline is growing, with a market of almost 81,900 commercial properties in 2016 including several prominent skyscrapers. The city is known for its arts, culture, and rich history, Philadelphia has more outdoor sculptures and murals than any other American city. Fairmount Park, when combined with the adjacent Wissahickon Valley Park in the watershed, is one of the largest contiguous urban park areas in the United States. The 67 National Historic Landmarks in the city helped account for the $10 billion generated by tourism, Philadelphia is the only World Heritage City in the United States. Before Europeans arrived, the Philadelphia area was home to the Lenape Indians in the village of Shackamaxon, the Lenape are a Native American tribe and First Nations band government. They are also called Delaware Indians and their territory was along the Delaware River watershed, western Long Island. Most Lenape were pushed out of their Delaware homeland during the 18th century by expanding European colonies, Lenape communities were weakened by newly introduced diseases, mainly smallpox, and violent conflict with Europeans. Iroquois people occasionally fought the Lenape, surviving Lenape moved west into the upper Ohio River basin. The American Revolutionary War and United States independence pushed them further west, in the 1860s, the United States government sent most Lenape remaining in the eastern United States to the Indian Territory under the Indian removal policy. In the 21st century, most Lenape now reside in the US state of Oklahoma, with communities living also in Wisconsin, Ontario. The Dutch considered the entire Delaware River valley to be part of their New Netherland colony, in 1638, Swedish settlers led by renegade Dutch established the colony of New Sweden at Fort Christina and quickly spread out in the valley. In 1644, New Sweden supported the Susquehannocks in their defeat of the English colony of Maryland
16.
Detroit
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Detroit is the most populous city in the U. S. state of Michigan, the fourth-largest city in the Midwest and the largest city on the United States–Canada border. It is the seat of Wayne County, the most populous county in the state, the municipality of Detroit had a 2015 estimated population of 677,116, making it the 21st-most populous city in the United States. Roughly one-half of Michigans population lives in Metro Detroit alone, the Detroit–Windsor area, a commercial link straddling the Canada–U. S. Border, has a population of about 5.7 million. Detroit is a port on the Detroit River, a strait that connects the Great Lakes system to the Saint Lawrence Seaway. The Detroit Metropolitan Airport is among the most important hubs in the United States, the City of Detroit anchors the second-largest economic region in the Midwest, behind Chicago, and the thirteenth-largest in the United States. Detroit and its neighboring Canadian city Windsor are connected through a tunnel and various bridges, Detroit was founded on July 24,1701 by the French explorer and adventurer Antoine de la Mothe Cadillac and a party of settlers. During the 19th century, it became an important industrial hub at the center of the Great Lakes region, with expansion of the American automobile industry in the early 20th century, the Detroit area emerged as a significant metropolitan region within the United States. The city became the fourth-largest in the country for a period, in the 1950s and 1960s, suburban expansion continued with construction of a regional freeway system. A great portion of Detroits public transport was abandoned in favour of becoming a city in the post-war period. Due to industrial restructuring and loss of jobs in the auto industry, between 2000 and 2010 the citys population fell by 25 percent, changing its ranking from the nations 10th-largest city to 18th. In 2010, the city had a population of 713,777 and this resulted from suburbanization, corruption, industrial restructuring and the decline of Detroits auto industry. In 2013, the state of Michigan declared an emergency for the city. Detroit has experienced urban decay as its population and jobs have shifted to its suburbs or elsewhere, conservation efforts managed to save many architectural pieces since the 2000s and allowed several large-scale revitalisations. More recently, the population of Downtown Detroit, Midtown Detroit, paleo-Indian people inhabited areas near Detroit as early as 11,000 years ago. In the 17th century, the region was inhabited by Huron, Odawa, Potawatomi, for the next hundred years, virtually no British, colonist, or French action was contemplated without consultation with, or consideration of the Iroquois likely response. When the French and Indian War evicted the Kingdom of France from Canada, the 1798 raids and resultant 1799 decisive Sullivan Expedition reopened the Ohio Country to westward emigration, which began almost immediately, and by 1800 white settlers were pouring westwards. By 1773, the population of Detroit was 1,400, by 1778, its population was up to 2,144 and it was the third-largest city in the Province of Quebec
17.
St. Louis
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St. Louis is an independent city and major U. S. port in the state of Missouri, built along the western bank of the Mississippi River, on the border with Illinois. Prior to European settlement, the area was a regional center of Native American Mississippian culture. The city of St. Louis was founded in 1764 by French fur traders Pierre Laclède and Auguste Chouteau, in 1764, following Frances defeat in the Seven Years War, the area was ceded to Spain and retroceded back to France in 1800. In 1803, the United States acquired the territory as part of the Louisiana Purchase, during the 19th century, St. Louis developed as a major port on the Mississippi River. In the 1870 Census, St. Louis was ranked as the 4th-largest city in the United States and it separated from St. Louis County in 1877, becoming an independent city and limiting its own political boundaries. In 1904, it hosted the Louisiana Purchase Exposition and the Summer Olympics, the economy of metro St. Louis relies on service, manufacturing, trade, transportation of goods, and tourism. This city has become known for its growing medical, pharmaceutical. St. Louis has 2 professional sports teams, the St. Louis Cardinals of Major League Baseball, the city is commonly identified with the 630-foot tall Gateway Arch in Downtown St. Louis. The area that would become St. Louis was a center of the Native American Mississippian culture and their major regional center was at Cahokia Mounds, active from 900 AD to 1500 AD. Due to numerous major earthworks within St. Louis boundaries, the city was nicknamed as the Mound City and these mounds were mostly demolished during the citys development. Historic Native American tribes in the area included the Siouan-speaking Osage people, whose territory extended west, European exploration of the area was first recorded in 1673, when French explorers Louis Jolliet and Jacques Marquette traveled through the Mississippi River valley. Five years later, La Salle claimed the region for France as part of La Louisiane. The earliest European settlements in the area were built in Illinois Country on the east side of the Mississippi River during the 1690s and early 1700s at Cahokia, Kaskaskia, migrants from the French villages on the opposite side of the Mississippi River founded Ste. In early 1764, after France lost the 7 Years War, Pierre Laclède, the early French families built the citys economy on the fur trade with the Osage, as well as with more distant tribes along the Missouri River. The Chouteau brothers gained a monopoly from Spain on the fur trade with Santa Fe, French colonists used African slaves as domestic servants and workers in the city. In 1780 during the American Revolutionary War, St. Louis was attacked by British forces, mostly Native American allies, the founding of St. Louis began in 1763. Pierre Laclede led an expedition to set up a fur-trading post farther up the Mississippi River, before then, Laclede had been a very successful merchant. For this reason, he and his trading partner Gilbert Antoine de St. Maxent were offered monopolies for six years of the fur trading in that area
18.
William L. Johnston
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William L. Johnston was a carpenter-architect who taught architectural drawing at the Carpenters Company of Philadelphia, and won a number of important Philadelphia commissions. He died of tuberculosis at the age of 38 after a trip abroad for his health and this mammoth Greek-Revival mansion on a 500-acre estate was the largest private residence in Philadelphia. Mercantile Library,125 S. 5th St. Philadelphia, PA, Bank of Commerce,211 Chestnut St. Philadelphia, PA. BANK OF COMMERCE, formerly the Moyamensing Bank, incorporated in the year 1832, with a capital of $250,000. The present banking-house of this institution, located in Chestnut west of Second Street, is constructed of brown stone, in the design of this building, the architect, the late Mr. Central Presbyterian Church, 832-36 Lombard St. Philadelphia, PA. Founded by Rev. Stephen H. Gloucester, a former slave, the congregation moved to West Philadelphia in 1939, and the building is now a private residence. Entrance Gate to Hood Cemetery,4901 Germantown Ave. Germantown, Philadelphia, Jayne Building, 242-44 Chestnut St. Philadelphia, PA. Charles E. Petersons efforts to save the building were unsuccessful, in addition to his Philadelphia buildings, Johnston was commissioned in 1847 to design the Orange Grove Plantation House in Terrebonne Parish, Louisiana. Intended for Thomas A. Morgan, a descendant of the prominent Morgan family of Pennsylvania and it featured Tudor elements and meticulous hand-crafted details that were built in Philadelphia and transported to Louisiana to be assembled there. William Johnson Architect published with Peter Nicholson the Thirteenth Edition of The Carpenters New Guide Being a Complete Book of Lines for Carpentry and Joinery, Grigg, Elliot, the printers were T. K. and P. G. Collins, Printers of Philadelphia. The book is listed as number 835 in Henry-Russell Hitchcocks American Architectural Books published in American before 1895, charles E. Peterson, Ante-Bellum Skyscraper in Journal of the Society of Architectural Historians, vol. James E. Massey, Carpenters School, 1833-42 in Journal of the Society of Architectural Historians, ada Louise Huxtable, Jayne Building - 1849-50 in Progressive Architecture, vol
19.
Equitable Life Building (Manhattan)
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The Equitable Life Assurance Building was the headquarters of The Equitable Life Assurance Society of the United States. Construction was completed on May 1,1870 at 120 Broadway in New York City, at a then-record 130 feet, it is considered by some the worlds first skyscraper. The architects were Arthur Gilman and Edward H. Kendall, with George B, post as a consulting engineer and hydraulic elevators made by the Elisha Otis company. The building, described as fireproof, was destroyed by a fire on January 9,1912. Extremely cold weather caused the water from the trucks to freeze on the building. The present Equitable Building was completed in 1915 on the same plot, the massive bulk of the newer building was a major impetus behind the citys 1916 Zoning Resolution. —pamphlet about the fire, published in 1912 and available on Archive. org
20.
Masonry
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Masonry is the building of structures from individual units, which are often laid in and bound together by mortar, the term masonry can also refer to the units themselves. The common materials of construction are brick, building stone such as marble, granite, travertine, and limestone, cast stone, concrete block, glass block. Masonry is generally a durable form of construction. However, the used, the quality of the mortar and workmanship. A person who constructs masonry is called a mason or bricklayer, Masonry is commonly used for walls and buildings. Brick and concrete block are the most common types of masonry in use in industrialized nations, Concrete blocks, especially those with hollow cores, offer various possibilities in masonry construction. They generally provide great strength, and are best suited to structures with light transverse loading when the cores remain unfilled. Filling some or all of the cores with concrete or concrete with steel reinforcement offers much greater tensile, the use of material such as bricks and stones can increase the thermal mass of a building and can protect the building from fire. Masonry walls are resistant to projectiles, such as debris from hurricanes or tornadoes. Extreme weather, under circumstances, can cause degradation of masonry due to expansion. Masonry tends to be heavy and must be built upon a foundation, such as reinforced concrete. Other than concrete, masonry construction does not lend well to mechanization. Masonry consists of components and has a low tolerance to oscillation as compared to other materials such as reinforced concrete, plastics, wood. Masonry has high compressive strength under vertical loads but has low tensile strength unless reinforced, the tensile strength of masonry walls can be increased by thickening the wall, or by building masonry piers at intervals. Where practical, steel reinforcements such as windposts can be added, a masonry veneer wall consists of masonry units, usually clay-based bricks, installed on one or both sides of a structurally independent wall usually constructed of wood or masonry. In this context the brick masonry is primarily decorative, not structural, the brick veneer is generally connected to the structural wall by brick ties. There is typically an air gap between the veneer and the structural wall. Concrete blocks, real and cultured stones, and veneer adobe are sometimes used in a very similar veneer fashion
21.
Monadnock Building
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The Monadnock Building is a skyscraper located at 53 West Jackson Boulevard in the south Loop area of Chicago, Illinois. The north half of the building was designed by the firm of Burnham & Root, the tallest load-bearing brick building ever constructed, it employed the first portal system of wind bracing in America. Its decorative staircases represent the first structural use of aluminum in building construction, the south half, constructed in 1893, was designed by Holabird & Roche and is similar in color and profile to the original, but the design is more traditionally ornate. When completed, it was the largest office building in the world, the success of the building was the catalyst for an important new business center at the southern end of the Loop. It was sold in 1979 to owners who restored the building to its original condition, the project was recognized as one of the top restoration projects in the USA by the National Trust for Historic Preservation in 1987. The building is divided into offices from 250 square feet to 6,000 square feet in size and it was listed for sale in 2007. The north half is an unornamented vertical mass of purple-brown brick, flaring out at the base and top. The south half is divided by brickwork at the base. Projecting window bays in both halves allow large exposures of glass, giving the building an appearance despite its mass. The Monadnock is part of the Printing House Row District, which includes the Fisher Building, the Manhattan Building. When it was built, many called the building too extreme. Others found in its lack of ornamentation the natural extension of its commercial purpose, early 20th-century European architects found inspiration in its attention to purpose and functional expression. It was one of the first buildings named a Chicago Architectural Landmark in 1958 and it was added to the National Register of Historic Places in 1970, and named as part of the National Historic Landmark South Dearborn Street – Printing House Row North Historic District in 1976. Modern critics have called it a classic, a triumph of unified design, the Monadnock was commissioned by Boston real estate developers Peter and Shepherd Brooks in the building boom following the Depression of 1873–79. It was Aldis, one of two men Louis Sullivan credited with being responsible for the office building, who convinced investors such as the Brooks brothers to build new skyscrapers in Chicago. By the end of the century, Aldis would create over 1,000,000 square feet of new office space and manage nearly one fifth of the office space in the Loop. Daniel Burnham and John Wellborn Root met as young draftsmen in the Chicago firm of Carter, Drake, at Aldiss urging, the Brooks brothers had retained the then-fledgling firm to design the Grannis Block, which was their first major commission. The Great Chicago Fire of 1871 had destroyed a 4-mile by 0, between 1881 and 1885, Aldis bought a series of lots in the area on Peter Brooks behalf, including a 70-by-200-foot site on the corner of Jackson and Dearborn streets
22.
Louis Sullivan
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Louis Henry Sullivan was an American architect, and has been called the father of skyscrapers and father of modernism. Along with Wright and Henry Hobson Richardson, Sullivan is one of the trinity of American architecture. Form follows function is attributed to him although he credited the origin of the concept to an ancient Roman architect, in 1944, he was the second architect in history to posthumously receive the AIA Gold Medal. Louis Henry Sullivan was born to a Swiss-born mother, née Andrienne List, and he learned that he could both graduate from high school a year early and bypass the first two years at the Massachusetts Institute of Technology by passing a series of examinations. Entering MIT at the age of sixteen, he studied architecture there briefly, after one year of study, he moved to Philadelphia and took a job with architect Frank Furness. The Depression of 1873 dried up much of Furnesss work, at that point Sullivan moved on to Chicago in 1873 to take part in the building boom following the Great Chicago Fire of 1871. He worked for William LeBaron Jenney, the architect credited with erecting the first steel frame building. After less than a year with Jenney, Sullivan moved to Paris and he returned to Chicago and began work for the firm of Joseph S. Johnston & John Edelman as a draftsman. Johnston & Edleman were commissioned for the design of the Moody Tabernacle, in 1879 Dankmar Adler hired Sullivan. A year later, Sullivan became a partner in the firm and this marked the beginning of Sullivans most productive years. Adler and Sullivan initially achieved fame as theater architects, while most of their theaters were in Chicago, their fame won commissions as far west as Pueblo, Colorado, and Seattle, Washington. After 1889 the firm known for their office buildings, particularly the 1891 Wainwright Building in St. Louis. Prior to the century, the weight of a multistory building had to be supported principally by the strength of its walls. The development of cheap, versatile steel in the half of the nineteenth century changed those rules. America was in the midst of social and economic growth that made for great opportunities in architectural design. A much more urbanized society was forming and the society called out for new, the mass production of steel was the main driving force behind the ability to build skyscrapers during the mid-1880s. By assembling a framework of steel girders, architects and builders suddenly could create tall, slender buildings with a strong, the rest of the building elements—walls, floors, ceilings, and windows—were suspended from the skeleton, which carried the weight. This new way of constructing buildings, so-called column-frame construction, pushed them up rather than out, the steel weight-bearing frame allowed not just taller buildings, but permitted much larger windows, which meant more daylight reaching interior spaces
23.
Council on Tall Buildings and Urban Habitat
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The Council on Tall Buildings and Urban Habitat is an international body in the field of tall buildings and sustainable urban design. Its stated mission is to study and report on all aspects of the planning, design, the Council was founded at Lehigh University in 1969 by Lynn S. Beedle, where its office remained until October 2003 when it moved to the Illinois Institute of Technology in Chicago. The CTBUH ranks the height of buildings using three different methods, Height to architectural top, This is the criterion under which the CTBUH ranks the height of buildings. Heights are measured from the level of the lowest, significant, open-air, pedestrian entrance to the top of the building, inclusive of spires but excluding items such as flagpoles and antennae. Highest occupied floor, Height to the level of the highest floor that is occupied by residents. Height to tip, Height to the highest point of the building, including antennae, flagpoles, a category measuring to the top of the roof was removed from the ranking criteria in November 2009. This became the CTBUH official definition of a building’s completion, the CTBUH maintains an extensive database of the tallest buildings in the world, organized by various categories. Buildings under construction are included, although not ranked until completion. The CTBUH also produces an annual list of the ten tallest buildings completed in that particular year. Second on the 2008 list was the 363-metre Almas Tower in Dubai, third was the Minsheng Bank Building in Wuhan which stands at 331 metres, whilst fourth was The Address Downtown Burj Dubai. All in all, six of the ten tallest buildings completed in 2008 are located in Asia, the CTBUH also hosts annual conferences and a World Congress every three to five years. The most recent World Congress was held in Shanghai between 19 and 21 September 2012, the next World Congress will be held in Shanghai between 16 and 19 September 2014. The CTBUH also bestows Tall Building Awards each year, with four awards to the Americas, Europe, Africa and the Middle East. Among these four regional awards, one is given the Best Tall Building Award Overall, there are also two lifetime achievement awards. Starting in 2010, these awards are presented at a symposium, in 2012 the CTBUH added two new awards for Innovation and Performance. In addition to the newsletter and daily updated global news archive. The Journal includes peer-reviewed technical papers, in-depth project case studies, book reviews, interviews with prominent persons in the building industry. The CTBUH also publishes guidebooks, reference manuals, and monographs related to the building industry
24.
Emporis
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Emporis GmbH is a real estate data mining company with headquarters in Hamburg, Germany. The company collects and publishes data and photographs of buildings worldwide, Emporis offers a variety of information on its public database, Emporis. com, located at www. emporis. com. Emporis is frequently cited by media sources as an authority on building data. Emporis previously focused exclusively on high-rise buildings and skyscrapers, which it defines as buildings between 35 and 100 metres tall and at least 100 metres tall, respectively, today, the database has expanded to include low-rise buildings and other structures. Michael Wutzke started a website about skyscrapers in Frankfurt in 1996, in 2000 he started skyscrapers. com which was folded into Emporis in 2003. In 2004, Stephan R. Boehm assumed the role of Chairman, Wutzke was Chief Technology Officer and managing director until 2010, when he left the company. In 2007 venture capital firm Neuhaus Partners and KfW Bankengruppe invested several million Euro in the company, effective January 1,2009, the company moved its headquarters from Darmstadt to Frankfurt. In 2011, the company moved from Frankfurt to Hamburg, in 2000 a group of Emporis senior editors began presenting the Emporis Skyscraper Award. Eligible buildings are selected from a list of all buildings in the world at least 100 meters tall which were completed that year
25.
Tower block
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A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building or structure used as a residential and/or office building. In some areas it may be referred to as an MDU, in the United States, such a structure is referred to as an apartment building or office building, while a group of such buildings is called an apartment complex or office complex. High-rise buildings became possible with the invention of the elevator and cheaper, the materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most North American style skyscrapers have a frame, while residential blocks are usually constructed of concrete. There is no difference between a tower block and a skyscraper, although a building with fifty or more stories is generally considered a skyscraper. They also pose challenges to firefighters during emergencies in high-rise structures. Studies are often required to ensure that pedestrian wind comfort and wind danger concerns are addressed, in order to allow less wind exposure, to transmit more daylight to the ground and to appear more slender, many high-rises have a design with setbacks. In contrast with low-rise and single-family houses, apartment blocks accommodate more inhabitants per unit of area of land, various bodies have defined high-rise, Emporis Standards defines a high-rise as A multi-story structure between 35–100 meters tall, or a building of unknown height from 12–39 floors. According to the code of Hyderabad, India, a high-rise building is one with four floors or more. The New Shorter Oxford English Dictionary defines a high-rise as a building having many storeys, most building engineers, inspectors, architects and similar professionals define a high-rise as a building that is at least 75 feet tall. The lower floors were occupied by either shops or wealthy families. Surviving Oxyrhynchus Papyri indicate that seven-story buildings even existed in provincial towns, in Arab Egypt, the initial capital city of Fustat housed many high-rise residential buildings, some seven stories tall that could reportedly accommodate hundreds of people. By the 16th century, Cairo also had high-rise apartment buildings where the two floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants. The skyline of many important medieval cities was dominated by large numbers of high-rising urban towers, the residential Towers of Bologna numbered between 80 and 100 at a time, the largest of which still rise to 97.2 m. In Florence, a law of 1251 decreed that all buildings should be reduced to a height of less than 26 m. Even medium-sized towns such as San Gimignano are known to have featured 72 towers up to 51 m in height, the oldest still standing tulou dates back from the 14th century. Tower blocks were built in the Yemeni city of Shibam in the 16th century. The houses of Shibam are all out of mud bricks, but about five hundred of them are tower houses
26.
Structural load
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Structural loads or actions are forces, deformations, or accelerations applied to a structure or its components. Loads cause stresses, deformations, and displacements in structures, assessment of their effects is carried out by the methods of structural analysis. Excess load or overloading may cause failure, and hence such possibility should be either considered in the design or strictly controlled. Mechanical structures, such as aircraft, satellites, rockets, space stations, ships, engineers often evaluate structural loads based upon published regulations, contracts, or specifications. Accepted technical standards are used for testing and inspection. Dead loads are static forces that are constant for an extended time. They can be in tension or compression, the term can refer to a laboratory test method or to the normal usage of a material or structure. Live loads are usually unstable or moving loads and these dynamic loads may involve considerations such as impact, momentum, vibration, slosh dynamics of fluids, etc. An impact load is one time of application on a material is less than one-third of the natural period of vibration of that material. Cyclic loads on a structure can lead to damage, cumulative damage. These loads can be repeated loadings on a structure or can be due to vibration, structural loads are an important consideration in the design of buildings. Building codes require that structures be designed and built to safely resist all actions that they are likely to face during their service life, minimum loads or actions are specified in these building codes for types of structures, geographic locations, usage and materials of construction. Structural loads are split into categories by their originating cause, in terms of the actual load on a structure, there is no difference between dead or live loading, but the split occurs for use in safety calculations or ease of analysis on complex models. To meet the requirement that design strength be higher than maximum loads, building codes prescribe that, for structural design and these load factors are, roughly, a ratio of the theoretical design strength to the maximum load expected in service. The dead load includes loads that are constant over time, including the weight of the structure itself. The roof is also a dead load, dead loads are also known as permanent or static loads. Building materials are not dead loads until constructed in permanent position, iS875-1987 give unit weight of building materials, parts, components. Live loads, or imposed loads, are temporary, of short duration and these dynamic loads may involve considerations such as impact, momentum, vibration, slosh dynamics of fluids and material fatigue
27.
Earthquake
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An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earths lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to people around. The seismicity or seismic activity of an area refers to the frequency, type, Earthquakes are measured using measurements from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe and these two scales are numerically similar over their range of validity. Magnitude 3 or lower earthquakes are mostly imperceptible or weak and magnitude 7 and over potentially cause damage over larger areas. The largest earthquakes in historic times have been of magnitude slightly over 9, intensity of shaking is measured on the modified Mercalli scale. The shallower an earthquake, the damage to structures it causes. At the Earths surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground, when the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity, in its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of faults, but also by other events such as volcanic activity, landslides, mine blasts. An earthquakes point of rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter, tectonic earthquakes occur anywhere in the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. The sides of a fault move past each other smoothly and aseismically only if there are no irregularities or asperities along the surface that increase the frictional resistance. Most fault surfaces do have such asperities and this leads to a form of stick-slip behavior, once the fault has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the portion of the fault. This energy is released as a combination of radiated elastic strain seismic waves, frictional heating of the fault surface and this process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the elastic-rebound theory. It is estimated that only 10 percent or less of a total energy is radiated as seismic energy. Most of the energy is used to power the earthquake fracture growth or is converted into heat generated by friction
28.
Tower
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A tower is a tall structure, taller than it is wide, often by a significant margin. Towers are distinguished from masts by their lack of guy-wires and are therefore, along with tall buildings, Towers are specifically distinguished from buildings in that they are not built to be habitable but to serve other functions. Towers can be stand alone structures or be supported by adjacent buildings or can be a feature on top of a structure or building. Old English torr is from Latin turris via Old French tor, the Latin term together with Greek τύρσις was loaned from a pre-Indo-European Mediterranean language, connected with the Illyrian toponym Βου-δοργίς. The oldest known may be the stone tower in walls of Neolithic Jericho. Some of the earliest towers were ziggurats, which existed in Sumerian architecture since the 4th millennium BC, the most famous ziggurats include the Sumerian Ziggurat of Ur, built the 3rd millennium BC, and the Etemenanki, one of the most famous examples of Babylonian architecture. The latter was built in Babylon during the 2nd millennium BC and was considered the tallest tower of the ancient world, some of the earliest surviving examples are the broch structures in northern Scotland, which are conical towerhouses. These and other examples from Phoenician and Roman cultures emphasised the use of a tower in fortification, for example, the name of the Moroccan city of Mogador, founded in the first millennium BC, is derived from the Phoenician word for watchtower. The Romans utilised octagonal towers as elements of Diocletians Palace in Croatia, which monument dates to approximately 300 AD, while the Servian Walls, the Chinese used towers as integrated elements of the Great Wall of China in 210 BC during the Qin Dynasty. Towers were also an important element of castles, other well known towers include the Leaning Tower of Pisa in Pisa, Italy built from 1173 until 1372 and the Two Towers in Bologna, Italy built from 1109 until 1119. The Himalayan Towers are stone towers located chiefly in Tibet built approximately 14th to 15th century, up to a certain height, a tower can be made with the supporting structure with parallel sides. However, above a height, the compressive load of the material is exceeded. This can be avoided if the support structure tapers up the building. A second limit is that of buckling—the structure requires sufficient stiffness to avoid breaking under the loads it faces, many very tall towers have their support structures at the periphery of the building, which greatly increases the overall stiffness. A third limit is dynamic, a tower is subject to varying winds, vortex shedding and these are often dealt with through a combination of simple strength and stiffness, as well as in some cases tuned mass dampers to damp out movements. Varying or tapering the outer aspect of the tower with height avoids vibrations due to vortex shedding occurring along the building simultaneously. Although not correctly called towers many modern skyscraper are often called towers, in the United Kingdom, tall domestic buildings are referred to as tower blocks. In the United States, the original World Trade Center had the nickname the Twin Towers, the tower throughout history has provided its users with an advantage in surveying defensive positions and obtaining a better view of the surrounding areas, including battlefields
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Axis mundi
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The axis mundi, in certain beliefs and philosophies, is the world center, or the connection between Heaven and Earth. As the celestial pole and geographic pole, it expresses a point of connection between sky and earth where the four directions meet. At this point travel and correspondence is made higher and lower realms. Communication from lower realms may ascend to higher ones and blessings from higher realms may descend to lower ones, the spot functions as the omphalos, the worlds point of beginning. The image is viewed as feminine, as it relates to the center of the earth. It may have the form of an object or a product of human manufacture. Its proximity to heaven may carry implications that are religious or secular. The image appears in religious and secular contexts, the axis mundi symbol may be found in cultures utilizing shamanic practices or animist belief systems, in major world religions, and in technologically advanced urban centers. In Mircea Eliades opinion, Every Microcosm, every inhabited region, has a Centre, that is to say, the axis mundi is often associated with mandalas. The symbol originates in a natural and universal psychological perception, that the spot one occupies stands at the center of the world and this space serves as a microcosm of order because it is known and settled. Outside the boundaries of the microcosm lie foreign realms that, because they are unfamiliar or not ordered, represent chaos, from the center one may still venture in any of the four cardinal directions, make discoveries, and establish new centers as new realms become known and settled. Within the central known universe a specific locale-often a mountain or other elevated place, a spot where earth and sky come closest gains status as center of the center, high mountains are typically regarded as sacred by peoples living near them. Shrines are often erected at the summit or base, Mount Kunlun fills a similar role in China. For the ancient Hebrews Mount Zion expressed the symbol, sioux beliefs take the Black Hills as the axis mundi. Mount Kailash is holy to Hinduism and several religions in Tibet, the Pitjantjatjara people in central Australia consider Uluru to be central to both their world and culture. In ancient Mesopotamia the cultures of ancient Sumer and Babylon erected artificial mountains, or ziggurats and these supported staircases leading to temples at the top. The Hindu temples in India are often situated on high mountains, the pre-Columbian residents of Teotihuacán in Mexico erected huge pyramids featuring staircases leading to heaven. Jacobs Ladder is an axis mundi image, as is the Temple Mount, for Christians the Cross on Mount Calvary expresses the symbol
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Great Pyramid of Giza
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The Great Pyramid of Giza is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, initially at 146.5 metres, the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. Originally, the Great Pyramid was covered by casing stones that formed an outer surface. Some of the stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramids construction techniques, most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place. There are three chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished, the so-called Queens Chamber and Kings Chamber are higher up within the pyramid structure. It is believed the pyramid was built as a tomb for Fourth Dynasty Egyptian pharaoh Khufu and was constructed over a 20-year period, Khufus vizier, Hemiunu, is believed by some to be the architect of the Great Pyramid. It is thought that, at construction, the Great Pyramid was originally 280 Egyptian cubits tall, each base side was 440 cubits,230.4 metres long. The mass of the pyramid is estimated at 5.9 million tonnes, the volume, including an internal hillock, is roughly 2,500,000 cubic metres. Based on these estimates, building the pyramid in 20 years would involve installing approximately 800 tonnes of stone every day, the first precision measurements of the pyramid were made by Egyptologist Sir Flinders Petrie in 1880–82 and published as The Pyramids and Temples of Gizeh. Almost all reports are based on his measurements, many of the casing stones and inner chamber blocks of the Great Pyramid fit together with extremely high precision. Based on measurements taken on the casing stones, the mean opening of the joints is only 0.5 millimetre wide. The pyramid remained the tallest man-made structure in the world for over 3,800 years, the accuracy of the pyramids workmanship is such that the four sides of the base have an average error of only 58 millimetres in length. The base is horizontal and flat to within ±15 mm, the ratio of the perimeter to height of 1760/280 royal cubits equates to 2π to an accuracy of better than 0. 05%. Some Egyptologists consider this to have been the result of deliberate design proportion, verner wrote, We can conclude that although the ancient Egyptians could not precisely define the value of π, in practice they used it. Petrie, author of Pyramids and Temples of Gizeh concluded, but these relations of areas, others have argued that the Ancient Egyptians had no concept of pi and would not have thought to encode it in their monuments. They believe that the observed pyramid slope may be based on a simple seked slope choice alone, with no regard to the overall size, in 2013 rolls of papyrus were discovered written by some of those who delivered stone and other construction materials to Khufus brother at Giza
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Ancient Egypt
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Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. It is one of six civilizations to arise independently, Egyptian civilization followed prehistoric Egypt and coalesced around 3150 BC with the political unification of Upper and Lower Egypt under the first pharaoh Narmer. In the aftermath of Alexander the Greats death, one of his generals, Ptolemy Soter and this Greek Ptolemaic Kingdom ruled Egypt until 30 BC, when, under Cleopatra, it fell to the Roman Empire and became a Roman province. The success of ancient Egyptian civilization came partly from its ability to adapt to the conditions of the Nile River valley for agriculture, the predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which supported a more dense population, and social development and culture. Its art and architecture were widely copied, and its antiquities carried off to far corners of the world and its monumental ruins have inspired the imaginations of travelers and writers for centuries. The Nile has been the lifeline of its region for much of human history, nomadic modern human hunter-gatherers began living in the Nile valley through the end of the Middle Pleistocene some 120,000 years ago. By the late Paleolithic period, the climate of Northern Africa became increasingly hot and dry. In Predynastic and Early Dynastic times, the Egyptian climate was less arid than it is today. Large regions of Egypt were covered in treed savanna and traversed by herds of grazing ungulates, foliage and fauna were far more prolific in all environs and the Nile region supported large populations of waterfowl. Hunting would have been common for Egyptians, and this is also the period when many animals were first domesticated. The largest of these cultures in upper Egypt was the Badari, which probably originated in the Western Desert, it was known for its high quality ceramics, stone tools. The Badari was followed by the Amratian and Gerzeh cultures, which brought a number of technological improvements, as early as the Naqada I Period, predynastic Egyptians imported obsidian from Ethiopia, used to shape blades and other objects from flakes. In Naqada II times, early evidence exists of contact with the Near East, particularly Canaan, establishing a power center at Hierakonpolis, and later at Abydos, Naqada III leaders expanded their control of Egypt northwards along the Nile. They also traded with Nubia to the south, the oases of the desert to the west. Royal Nubian burials at Qustul produced artifacts bearing the oldest-known examples of Egyptian dynastic symbols, such as the crown of Egypt. They also developed a ceramic glaze known as faience, which was used well into the Roman Period to decorate cups, amulets, and figurines. During the last predynastic phase, the Naqada culture began using written symbols that eventually were developed into a system of hieroglyphs for writing the ancient Egyptian language. The Early Dynastic Period was approximately contemporary to the early Sumerian-Akkadian civilisation of Mesopotamia, the third-century BC Egyptian priest Manetho grouped the long line of pharaohs from Menes to his own time into 30 dynasties, a system still used today
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Lincoln Cathedral
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Lincoln Cathedral or the Cathedral Church of the Blessed Virgin Mary of Lincoln, and sometimes St. Marys Cathedral in Lincoln, England is the seat of the Anglican bishop. Building commenced in 1088 and continued in phases throughout the medieval period. It was the tallest building in the world for 238 years, the central spire collapsed in 1549 and was not rebuilt. The cathedral is the third largest in Britain after St Pauls and York Minster and it is highly regarded by architectural scholars, the eminent Victorian writer John Ruskin declared, I have always held. That the cathedral of Lincoln is out and out the most precious piece of architecture in the British Isles, laid the foundations of his Cathedral in 1088 and it is probable that he, being a Norman, employed Norman masons to superintend the building. Though he could not complete the whole before his death, winkles, It is well known that Remigius appropriated the parish church of St Mary Magdalene in Lincoln, although it is not known what use he made of it. Up until then St. Marys Church in Stow was considered to be the church of Lincolnshire. However, Lincoln was more central to a diocese that stretched from the Thames to the Humber, Bishop Remigius built the first Lincoln Cathedral on the present site, finishing it in 1092 and then dying on 7 May of that year, two days before it was consecrated. In 1141, the roofing was destroyed in a fire. Bishop Alexander rebuilt and expanded the cathedral, but it was destroyed by an earthquake about forty years later. The earthquake was one of the largest felt in the UK, some have suggested that the damage to Lincoln Cathedral was probably exaggerated by poor construction or design, with the actual collapse most probably caused by a vault collapse. After the earthquake, a new bishop was appointed and he was Hugh de Burgundy of Avalon, France, who became known as St Hugh of Lincoln. He began a rebuilding and expansion programme. Rebuilding began with the choir and the eastern transepts between 1192 and 1210, the central nave was then built in the Early English Gothic style. Lincoln Cathedral soon followed other architectural advances of the time – pointed arches, flying buttresses and this allowed support for incorporating larger windows. There are thirteen bells in the south-west tower, two in the north-west tower, and five in the central tower, accompanying the cathedrals large bell, Great Tom of Lincoln, is a quarter-hour striking clock. The clock was installed in the early 19th century, the two large stained glass rose windows, the matching Deans Eye and Bishops Eye, were added to the cathedral during the late Middle Ages. The former, the Deans Eye in the transept dates from the 1192 rebuild begun by St Hugh
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Washington Monument
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It is the tallest monumental column in the world if all are measured above their pedestrian entrances. Although the stone structure was completed in 1884, internal ironwork, the knoll, a difference in shading of the marble, visible approximately 150 feet or 27% up, shows where construction was halted and later resumed with marble from a different source. The original design was by Robert Mills, but he did not include his proposed colonnade due to a lack of funds, despite many proposals to embellish the obelisk, only its original flat top was altered to a pointed marble pyramidion, in 1884. Upon completion, it became the worlds tallest structure, a previously held by the Cologne Cathedral. The monument held this designation until 1889, when the Eiffel Tower was completed in Paris, the monument was damaged during the 2011 Virginia earthquake and Hurricane Irene in the same year and remained closed to the public while the structure was assessed and repaired. After 32 months of repairs, the National Park Service and the Trust for the National Mall reopened the Washington Monument to visitors on May 12,2014, as of September 2016, the monument has been closed indefinitely due to reliability issues with the current elevator system. On December 2,2016, the National Park Service announced that the monument would be closed until 2019 in order to modernize the elevator. The $2 to 3 million project will correct the elevators ongoing mechanical, electrical and computer issues, the National Park Service has also requested funding in its FY2017 Presidents Budget Request to construct a permanent screening facility for the Washington Monument. The Washington Monument is expected to re-open to visitors in 2019, even his erstwhile enemy King George III called him the greatest character of the age. At his death in 1799 he left a legacy, he exemplified the core ideals of the American Revolution. Washington was the unchallenged public icon of American military and civic patriotism, starting with victory in the Revolution, there were many proposals to build a monument to Washington. After his death, Congress authorized a memorial in the national capital. The Republicans were dismayed that Washington had become the symbol of the Federalist Party and they also blocked his image on coins or the celebration of his birthday. Further political squabbling, along with the North-South division on the Civil War, by that time, Washington had the image of a national hero who could be celebrated by both North and South, and memorials to him were no longer controversial. As early as 1783, the Continental Congress had resolved That an equestrian statue of George Washington be erected at the place where the residence of Congress shall be established, currently, there are two equestrian statues of President Washington in Washington, D. C. Ten days after Washingtons death, a Congressional committee recommended a different type of monument, John Marshall, a Representative from Virginia proposed that a tomb be erected within the Capitol. Progress toward a memorial began in 1832. That year, which marked the 100th anniversary of Washingtons birth, in 1836, after they had raised $28,000 in donations, they announced a competition for the design of the memorial
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Classical antiquity
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It is the period in which Greek and Roman society flourished and wielded great influence throughout Europe, North Africa and Southwestern Asia. Conventionally, it is taken to begin with the earliest-recorded Epic Greek poetry of Homer, and continues through the emergence of Christianity and it ends with the dissolution of classical culture at the close of Late Antiquity, blending into the Early Middle Ages. Such a wide sampling of history and territory covers many disparate cultures, Classical antiquity may refer also to an idealised vision among later people of what was, in Edgar Allan Poes words, the glory that was Greece, and the grandeur that was Rome. The culture of the ancient Greeks, together with influences from the ancient Near East, was the basis of art, philosophy, society. The earliest period of classical antiquity takes place before the background of gradual re-appearance of historical sources following the Bronze Age collapse, the 8th and 7th centuries BC are still largely proto-historical, with the earliest Greek alphabetic inscriptions appearing in the first half of the 8th century. Homer is usually assumed to have lived in the 8th or 7th century BC, in the same period falls the traditional date for the establishment of the Ancient Olympic Games, in 776 BC. The Phoenicians originally expanded from Canaan ports, by the 8th century dominating trade in the Mediterranean, carthage was founded in 814 BC, and the Carthaginians by 700 BC had firmly established strongholds in Sicily, Italy and Sardinia, which created conflicts of interest with Etruria. The Etruscans had established control in the region by the late 7th century BC, forming the aristocratic. According to legend, Rome was founded on April 21,753 BC by twin descendants of the Trojan prince Aeneas, Romulus and Remus. As the city was bereft of women, legend says that the Latins invited the Sabines to a festival and stole their unmarried maidens, leading to the integration of the Latins and the Sabines. Archaeological evidence indeed shows first traces of settlement at the Roman Forum in the mid-8th century BC, the seventh and final king of Rome was Tarquinius Superbus. As the son of Tarquinius Priscus and the son-in-law of Servius Tullius, Superbus was of Etruscan birth and it was during his reign that the Etruscans reached their apex of power. Superbus removed and destroyed all the Sabine shrines and altars from the Tarpeian Rock, the people came to object to his rule when he failed to recognize the rape of Lucretia, a patrician Roman, at the hands of his own son. Lucretias kinsman, Lucius Junius Brutus, summoned the Senate and had Superbus, after Superbus expulsion, the Senate voted to never again allow the rule of a king and reformed Rome into a republican government in 509 BC. In fact the Latin word Rex meaning King became a dirty and hated throughout the Republic. In 510, Spartan troops helped the Athenians overthrow the tyrant Hippias, cleomenes I, king of Sparta, put in place a pro-Spartan oligarchy conducted by Isagoras. Greece entered the 4th century under Spartan hegemony, but by 395 BC the Spartan rulers removed Lysander from office, and Sparta lost her naval supremacy. Athens, Argos, Thebes and Corinth, the two of which were formerly Spartan allies, challenged Spartan dominance in the Corinthian War, which ended inconclusively in 387 BC
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Ancient Rome
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In its many centuries of existence, the Roman state evolved from a monarchy to a classical republic and then to an increasingly autocratic empire. Through conquest and assimilation, it came to dominate the Mediterranean region and then Western Europe, Asia Minor, North Africa and it is often grouped into classical antiquity together with ancient Greece, and their similar cultures and societies are known as the Greco-Roman world. Ancient Roman civilisation has contributed to modern government, law, politics, engineering, art, literature, architecture, technology, warfare, religion, language and society. Rome professionalised and expanded its military and created a system of government called res publica, the inspiration for modern republics such as the United States and France. By the end of the Republic, Rome had conquered the lands around the Mediterranean and beyond, its domain extended from the Atlantic to Arabia, the Roman Empire emerged with the end of the Republic and the dictatorship of Augustus Caesar. 721 years of Roman-Persian Wars started in 92 BC with their first war against Parthia and it would become the longest conflict in human history, and have major lasting effects and consequences for both empires. Under Trajan, the Empire reached its territorial peak, Republican mores and traditions started to decline during the imperial period, with civil wars becoming a prelude common to the rise of a new emperor. Splinter states, such as the Palmyrene Empire, would divide the Empire during the crisis of the 3rd century. Plagued by internal instability and attacked by various migrating peoples, the part of the empire broke up into independent kingdoms in the 5th century. This splintering is a landmark historians use to divide the ancient period of history from the pre-medieval Dark Ages of Europe. King Numitor was deposed from his throne by his brother, Amulius, while Numitors daughter, Rhea Silvia, because Rhea Silvia was raped and impregnated by Mars, the Roman god of war, the twins were considered half-divine. The new king, Amulius, feared Romulus and Remus would take back the throne, a she-wolf saved and raised them, and when they were old enough, they returned the throne of Alba Longa to Numitor. Romulus became the source of the citys name, in order to attract people to the city, Rome became a sanctuary for the indigent, exiled, and unwanted. This caused a problem for Rome, which had a large workforce but was bereft of women, Romulus traveled to the neighboring towns and tribes and attempted to secure marriage rights, but as Rome was so full of undesirables they all refused. Legend says that the Latins invited the Sabines to a festival and stole their unmarried maidens, leading to the integration of the Latins, after a long time in rough seas, they landed at the banks of the Tiber River. Not long after they landed, the men wanted to take to the sea again, one woman, named Roma, suggested that the women burn the ships out at sea to prevent them from leaving. At first, the men were angry with Roma, but they realized that they were in the ideal place to settle. They named the settlement after the woman who torched their ships, the Roman poet Virgil recounted this legend in his classical epic poem the Aeneid
36.
Insula (building)
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The term was also used to mean a city block. The ground-level floor of the insula was used for tabernae, shops and businesses, like modern apartment buildings, an insula might have a name, usually referring to the owner of the building. Strabo notes that insulae, like domus, had running water, but this kind of housing was sometimes constructed at minimal expense for speculative purposes, resulting in insulae of poor construction. They were built in timber, mud brick, and later primitive concrete, among his many business interests, Marcus Licinius Crassus speculated in real estate and owned numerous insulae in the city. When one collapsed from poor construction, Cicero purportedly stated that Crassus was happy that he could charge higher rents for a new building than the collapsed one. Living quarters were typically smallest in the buildings uppermost floors, with the largest and most expensive apartments being located on the bottom floors. The insulae could be up to six or seven stories high, and despite height restrictions in the Imperial era, often those floors were without heating, running water or lavatories, which meant their occupants had to use Romes extensive system of public restrooms. Despite prohibitions, residents would sometimes dump trash and human excrement out the windows and into the surrounding streets, augustus instituted reforms aimed at increasing the safety of buildings in the city of Rome. According to the 4th-century regionaries, there were about 42, 000–46,000 insulae in the city, data on the number of insulae and to a lesser extent domus are used for classical demography. Photo of Insulae in Ostia Model of another insula in Ostia Insula 9, an excavation of a Pompeii insula Roman apartment building
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Roman Empire
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Civil wars and executions continued, culminating in the victory of Octavian, Caesars adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavians power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power, the imperial period of Rome lasted approximately 1,500 years compared to the 500 years of the Republican era. The first two centuries of the empires existence were a period of unprecedented political stability and prosperity known as the Pax Romana, following Octavians victory, the size of the empire was dramatically increased. After the assassination of Caligula in 41, the senate briefly considered restoring the republic, under Claudius, the empire invaded Britannia, its first major expansion since Augustus. Vespasian emerged triumphant in 69, establishing the Flavian dynasty, before being succeeded by his son Titus and his short reign was followed by the long reign of his brother Domitian, who was eventually assassinated. The senate then appointed the first of the Five Good Emperors, the empire reached its greatest extent under Trajan, the second in this line. A period of increasing trouble and decline began with the reign of Commodus, Commodus assassination in 192 triggered the Year of the Five Emperors, of which Septimius Severus emerged victorious. The assassination of Alexander Severus in 235 led to the Crisis of the Third Century in which 26 men were declared emperor by the Roman Senate over a time span. It was not until the reign of Diocletian that the empire was fully stabilized with the introduction of the Tetrarchy, which saw four emperors rule the empire at once. This arrangement was unsuccessful, leading to a civil war that was finally ended by Constantine I. Constantine subsequently shifted the capital to Byzantium, which was renamed Constantinople in his honour and it remained the capital of the east until its demise. Constantine also adopted Christianity which later became the state religion of the empire. However, Augustulus was never recognized by his Eastern colleague, and separate rule in the Western part of the empire ceased to exist upon the death of Julius Nepos. The Eastern Roman Empire endured for another millennium, eventually falling to the Ottoman Turks in 1453, the Roman Empire was among the most powerful economic, cultural, political and military forces in the world of its time. It was one of the largest empires in world history, at its height under Trajan, it covered 5 million square kilometres. It held sway over an estimated 70 million people, at that time 21% of the entire population. Throughout the European medieval period, attempts were made to establish successors to the Roman Empire, including the Empire of Romania, a Crusader state. Rome had begun expanding shortly after the founding of the republic in the 6th century BC, then, it was an empire long before it had an emperor
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Augustus
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Augustus was the founder of the Roman Principate and considered the first Roman emperor, controlling the Roman Empire from 27 BC until his death in AD14. He was born Gaius Octavius into an old and wealthy equestrian branch of the plebeian gens Octavia and his maternal great-uncle Julius Caesar was assassinated in 44 BC, and Octavius was named in Caesars will as his adopted son and heir, then known as Octavianus. He, Mark Antony, and Marcus Lepidus formed the Second Triumvirate to defeat the assassins of Caesar, following their victory at the Battle of Philippi, the Triumvirate divided the Roman Republic among themselves and ruled as military dictators. The Triumvate was eventually torn apart by the ambitions of its members. Lepidus was driven into exile and stripped of his position, in reality, however, he retained his autocratic power over the Republic as a military dictator. By law, Augustus held a collection of powers granted to him for life by the Senate, including supreme military command, and it took several years for Augustus to develop the framework within which a formally republican state could be led under his sole rule. He rejected monarchical titles, and instead called himself Princeps Civitatis, the resulting constitutional framework became known as the Principate, the first phase of the Roman Empire. The reign of Augustus initiated an era of peace known as the Pax Romana. Augustus dramatically enlarged the Empire, annexing Egypt, Dalmatia, Pannonia, Noricum, and Raetia, expanding possessions in Africa, expanding into Germania, beyond the frontiers, he secured the Empire with a buffer region of client states and made peace with the Parthian Empire through diplomacy. Augustus died in AD14 at the age of 75 and he probably died from natural causes, although there were unconfirmed rumors that his wife Livia poisoned him. He was succeeded as Emperor by his adopted son Tiberius, Augustus was known by many names throughout his life, At birth, he was named Gaius Octavius after his biological father. Historians typically refer to him simply as Octavius between his birth in 63 until his adoption by Julius Caesar in 44 BC, upon his adoption, he took Caesars name and became Gaius Julius Caesar Octavianus in accordance with Roman adoption naming standards. He quickly dropped Octavianus from his name, and his contemporaries referred to him as Caesar during this period, historians. In 27 BC, following his defeat of Mark Antony and Cleopatra and it is the events of 27 BC from which he obtained his traditional name of Augustus, which historians use in reference to him from 27 BC until his death in AD14. While his paternal family was from the town of Velletri, approximately 40 kilometres from Rome and he was born at Ox Head, a small property on the Palatine Hill, very close to the Roman Forum. He was given the name Gaius Octavius Thurinus, his cognomen possibly commemorating his fathers victory at Thurii over a band of slaves. Due to the nature of Rome at the time, Octavius was taken to his fathers home village at Velletri to be raised. Octavius only mentions his fathers equestrian family briefly in his memoirs and his paternal great-grandfather Gaius Octavius was a military tribune in Sicily during the Second Punic War
39.
Roman emperor
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The Roman emperor was the ruler of the Roman Empire during the imperial period. The emperors used a variety of different titles throughout history, often when a given Roman is described as becoming emperor in English, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific, early Emperors also used the title princeps. Emperors frequently amassed republican titles, notably Princeps Senatus, Consul, the first emperors reigned alone, later emperors would sometimes rule with co-Emperors and divide administration of the Empire between them. The Romans considered the office of emperor to be distinct from that of a king, the first emperor, Augustus, resolutely refused recognition as a monarch. Although Augustus could claim that his power was authentically republican, his successor, Tiberius, nonetheless, for the first three hundred years of Roman Emperors, from Augustus until Diocletian, a great effort was made to emphasize that the Emperors were the leaders of a Republic. Elements of the Republican institutional framework were preserved until the end of the Western Empire. The Eastern emperors ultimately adopted the title of Basileus, which had meant king in Greek, but became a title reserved solely for the Roman emperor, other kings were then referred to as rēgas. In addition to their office, some emperors were given divine status after death. The Western Roman Empire collapsed in the late 5th century, Romulus Augustulus is often considered to be the last emperor of the west after his forced abdication in 476, although Julius Nepos maintained a claim to the title until his death in 480. Constantine XI was the last Byzantine Roman emperor in Constantinople, dying in the Fall of Constantinople to the Ottomans in 1453, a Byzantine group of claimant Roman Emperors existed in the Empire of Trebizond until its conquest by the Ottomans in 1461. In western Europe the title of Roman Emperor was revived by Germanic rulers, the Holy Roman Emperors, in 800, at the end of the Roman Republic no new, and certainly no single, title indicated the individual who held supreme power. Insofar as emperor could be seen as the English translation of imperator, then Julius Caesar had been an emperor, however, Julius Caesar, unlike those after him, did so without the Senates vote and approval. Julius Caesar held the Republican offices of four times and dictator five times, was appointed dictator in perpetuity in 45 BC and had been pontifex maximus for a long period. He gained these positions by senatorial consent, by the time of his assassination, he was the most powerful man in the Roman world. In his will, Caesar appointed his adopted son Octavian as his heir, a decade after Caesars death, Octavians victory over his erstwhile ally Mark Antony at Actium put an end to any effective opposition and confirmed Octavians supremacy. His restoration of powers to the Senate and the people of Rome was a demonstration of his auctoritas, some later historians such as Tacitus would say that even at Augustus death, the true restoration of the Republic might have been possible. Instead, Augustus actively prepared his adopted son Tiberius to be his successor, the Senate disputed the issue but eventually confirmed Tiberius as princeps
40.
Oxyrhynchus Papyri
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The manuscripts date from the 1st to as late as the 7th century AD. They include thousands of Greek and Latin documents, letters and literary works and they also include a few vellum manuscripts, and more recent Arabic manuscripts on paper. The Oxyrhynchus Papyri are currently housed in many institutions all over the world, a substantial number are housed in the Ashmolean Museum at Oxford University. Although the initial hope of finding many of the lost literary works of antiquity at Oxyrhynchus was not realized and these include poems of Pindar, fragments of Sappho and Alcaeus, along with larger pieces of Alcman, Ibycus, and Corinna. There were also remains of the Hypsipyle of Euripides, fragments of the comedies of Menander. Also found were the oldest and most complete diagrams from Euclids Elements, another important find was the historical work known as the Hellenica Oxyrhynchia, whose author is unknown but may be Ephorus or, as many currently think, Cratippus. A life of Euripides by Satyrus the Peripatetic was also unearthed, Menanders plays found in fragments at Oxyrhynchus include Misoumenos, Dis Exapaton, Epitrepontes, Karchedonios, Dyskolos and Kolax. The works found at Oxyrhynchus have greatly raised Menanders status among classicists, there is an on-line table of contents briefly listing the type of contents of each papyrus or fragment. Among the Christian texts found at Oxyrhynchus, were fragments of early non-canonical Gospels, Oxyrhynchus 840, there are many parts of other canonical books as well as many early Christian hymns, prayers, and letters also found among them. All manuscripts classified as theological in the Oxyrhynchus Papyri are listed below, a few manuscripts that belong to multiple genres, or genres that are inconsistently treated in the volumes of the Oxyrhynchus Papyri, are also included. In each volume that contains theological manuscripts, they are listed first, the original Hebrew Bible was translated into Greek between the 3rd and 1st centuries BC. This translation is called the Septuagint, because there is a tradition that seventy Jewish scribes compiled it in Alexandria and it was quoted in the New Testament and is found bound together with the New Testament in the 4th and 5th century Greek uncial codices Sinaiticus, Alexandrinus and Vaticanus. The Septuagint included books, called the Apocrypha or Deuterocanonical by Christians, portions of Old Testament books of undisputed authority found among the Oxyrhynchus Papyri are listed in this section. The first number is the volume of the Oxyrhynchus Papyri in which the manuscript is published, the second number is the overall publication sequence number in Oxyrhynchus Papyri. Standard abbreviated citation of the Oxyrhynchus Papyri is, P. Oxy, <volume in Roman numerals> <publication sequence number>. Context will always make clear whether volume 70 of the Oxyrhynchus Papyri or the Septuagint is intended, VIII1073 is an Old Latin version of Genesis, other manuscripts are probably copies of the Septuagint. Dates are estimated to the nearest 50 year increment, content is given to the nearest verse where known. This name designates several, unique writings or different versions of pre-existing writings found in the canon of the Jewish scriptures
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Roman province
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In Ancient Rome, a province was the basic, and, until the Tetrarchy, largest territorial and administrative unit of the empires territorial possessions outside of Italy. The word province in modern English has its origins in the used by the Romans. Provinces were generally governed by politicians of senatorial rank, usually former consuls or former praetors and this exception was unique, but not contrary to Roman law, as Egypt was considered Augustus personal property, following the tradition of earlier, Hellenistic kings. The territory of a people who were defeated in war might be brought under various forms of treaty, the formal annexation of a territory created a province in the modern sense of an administrative unit geographically defined. Republican provinces were administered in one-year terms by the consuls and praetors who had held office the previous year, Rome started expanding beyond Italy during the First Punic War. The first permanent provinces to be annexed were Sicily in 241 BC, militarized expansionism kept increasing the number of these administrative provinces, until there were no longer enough qualified individuals to fill the posts. The terms of provincial governors often had to be extended for multiple years,241 BC – Sicilia taken over from the Carthaginians and annexed at the end of the First Punic War. 237 BC – Corsica et Sardinia, these two islands were taken over from the Carthaginians and annexed soon after the Mercenary War, in 238 BC and 237 BC respectively. 197 BC – Hispania Citerior, along the east coast of the,197 BC - Hispania Ulterior, along the southern coast of the, part of the territories taken over from the Carthaginians in the Second Punic War. 147 BC – Macedonia, mainland Greece and it was annexed after a rebellion by the Achaean League. 146 BC – Africa, modern day Tunisia and western Libya, home territory of Carthage and it was annexed following attacks on the allied Greek city of Massalia. 67 BC – Creta et Cyrenae, Cyrenaica was bequeathed to Rome in 78 BC, however, it was not organised as a province. 58 BC – Cilicia et Cyprus, Cilicia was created as a province in the sense of area of command in 102 BC in a campaign against piracy. The Romans controlled only a small area, in 74 BC Lycia and Pamphylia were added to the smal Roman possessions in Cilicia. Cilicia came fully under Roman control towards the end of the Third Mithridatic War - 73-63 BC, the province was reorganised by Pompey in 63 BC. Gallia Cisalpina was a province in the sense of an area of military command, during Romes expansion in Italy the Romans assigned some areas as provinces in the sense of areas of military command assigned to consuls or praetors due to risks of rebellions or invasions. This was applied to Liguria because there was a series of rebellions, Bruttium, in the early days of Roman presence in Gallia Cisalpina the issue was rebellion. Later the issue was risk of invasions by warlike peoples east of Italy, the city of Aquileia was founded to protect northern Italy form invasions
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Hermopolis
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Hermopolis was a major city in antiquity, located near the boundary between Lower and Upper Egypt. A provincial capital since the Old Kingdom period, Hermopolis developed into a city of Roman Egypt. It was abandoned after the Muslim invasion and its remains are located near the modern Egyptian town of El Ashmunein in Al Minya governorate. Khemenu, the Ancient Egyptian name of the city, means eight-town, after the Ogdoad, the name survived into Coptic as Ϣⲙⲟⲩⲛⲉⲓⲛ, from which the modern name, El Ashmunein, is derived. Thoth was associated in the way with the Semitic Eshmun. Inscriptions at the call the god The Lord of Eshmun. The city was the capital of the Hare nome in the Heptanomis, Hermopolis stood on the borders of Upper and Lower Egypt, and, for many ages, the Thebaïd or upper country extended much further to the north than in more recent periods. As the border town, Hermopolis was a place of resort and opulence. A little to south of the city was the castle of Hermopolis, the principal deities worshipped at Hermopolis were Typhôn and Thoth. Typhon was represented by a hippopotamus, on which sat a hawk fighting with a serpent, Thoth, whom the Ancient Greeks associated with Hermes because they were both gods of magic and writing, was represented by the Ibis. A surviving Oxyrhynchus Papyrus of the 3rd century AD indicates that buildings with seven stories existed in the town. The collection of Arabic papyri in the John Rylands Library, Manchester, contains many documents referring to Hermopolis, the city is still a titular diocese in the Roman Catholic Church, and in the Coptic Orthodox Church. The Ibis-headed god, was, with his accompanying emblems, the Ibis and the Cynocephalus or ape and his designation in inscriptions was The Lord of Eshmoon. The portico, the remnant of the temple, consists of a double row of pillars. The architraves are formed of five stones, each passes from the centre of one pillar to that of the next, the intercolumnation of the centre pillars is wider than that of the others, and the stone over the centre is twenty-five feet and six inches long. These columns were painted yellow, red, and blue in alternate bands, there is also a peculiarity in the pillars of the Hermopolitan portico peculiar to themselves, or, at least, discovered only again in the temple of Gournou. Instead of being formed of large masses placed horizontally above each other, they are composed of irregular pieces, the widest part of the intercolumnation is 17 feet, the other pillars are 13 feet apart. Currently there is a small museum in which stand two massive statues of Thoth as a baboon worshipping the sun, and a few carved blocks of masonry
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Egypt (Roman province)
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The province encompassed most of modern-day Egypt except for the Sinai Peninsula. Aegyptus was bordered by the provinces of Creta et Cyrenaica to the West, the province came to serve as a major producer of grain for the empire and had a highly developed urban economy. Aegyptus was by far the wealthiest Eastern Roman province, in Alexandria, its capital, it possessed the largest port, and the second largest city, of the Roman Empire. As a province, Egypt was ruled by a uniquely styled Augustal prefect, the prefect was a man of equestrian rank and was appointed by the Emperor. The second prefect, Aelius Gallus, made an expedition to conquer Arabia Petraea. The Red Sea coast of Aegyptus was not brought under Roman control until the reign of Claudius, the third prefect, Gaius Petronius, cleared the neglected canals for irrigation, stimulating a revival of agriculture. Petronius even led a campaign into present-day central Sudan against the Kingdom of Kush at Meroe, failing to acquire permanent gains, in 22 BC he razed the city of Napata to the ground and retreated to the north. From the reign of Nero onward, Aegyptus enjoyed an era of prosperity which lasted a century, under Trajan a Jewish revolt occurred, resulting in the suppression of the Jews of Alexandria and the loss of all their privileges, although they soon returned. Hadrian, who twice visited Aegyptus, founded Antinoöpolis in memory of his drowned lover Antinous, from his reign onward buildings in the Greco-Roman style were erected throughout the country. Under Antoninus Pius oppressive taxation led to a revolt in 139, of the native Egyptians and this Bucolic War, led by one Isidorus, caused great damage to the economy and marked the beginning of Egypts economic decline. Avidius Cassius, who led the Roman forces in the war, declared emperor in 175. On the approach of Marcus Aurelius, Cassius was deposed and killed, a similar revolt broke out in 193, when Pescennius Niger was proclaimed emperor on the death of Pertinax. The Emperor Septimius Severus gave a constitution to Alexandria and the capitals in 202. There was a series of revolts, both military and civilian, through the 3rd century, under Decius, in 250, the Christians again suffered from persecution, but their religion continued to spread. This warrior queen claimed that Egypt was a home of hers through a familial tie to Cleopatra VII. She was well educated and familiar with the culture of Egypt, its religion, two generals based in Aegyptus, Probus and Domitius Domitianus, led successful revolts and made themselves emperors. Diocletian captured Alexandria from Domitius in 298 and reorganised the whole province and his edict of 303 against the Christians began a new era of persecution. This was the last serious attempt to stem the growth of Christianity in Egypt
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Middle Ages
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In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The medieval period is subdivided into the Early, High. Population decline, counterurbanisation, invasion, and movement of peoples, the large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the seventh century, North Africa and the Middle East—once part of the Byzantine Empire—came under the rule of the Umayyad Caliphate, although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power, the empires law code, the Corpus Juris Civilis or Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions, monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th, the Crusades, first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims. Kings became the heads of centralised nation states, reducing crime and violence, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the conflict, civil strife. Cultural and technological developments transformed European society, concluding the Late Middle Ages, the Middle Ages is one of the three major periods in the most enduring scheme for analysing European history, classical civilisation, or Antiquity, the Middle Ages, and the Modern Period. Medieval writers divided history into periods such as the Six Ages or the Four Empires, when referring to their own times, they spoke of them as being modern. In the 1330s, the humanist and poet Petrarch referred to pre-Christian times as antiqua, leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People. Bruni and later argued that Italy had recovered since Petrarchs time. The Middle Ages first appears in Latin in 1469 as media tempestas or middle season, in early usage, there were many variants, including medium aevum, or middle age, first recorded in 1604, and media saecula, or middle ages, first recorded in 1625. The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius divided history into three periods, Ancient, Medieval, and Modern. The most commonly given starting point for the Middle Ages is 476, for Europe as a whole,1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period
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Towers of Bologna
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The Towers of Bologna are a group of medieval structures in Bologna, Italy. The two most prominent ones, known as the Two Towers, are the landmark of the city, between the 12th and the 13th century, the number of towers in the city was very high, possibly up to 180. The reasons for the construction of so many towers are not clear, one hypothesis is that the richest families used them for offensive/defensive purposes during the period of the Investiture Controversy. Besides the towers, one can see some fortified gateways that correspond to the gates of the 12th-century city wall. During the 13th century, many towers were taken down or demolished, many towers have subsequently been utilized in one way or the other, as prison, city tower, shop or residential building. The last demolitions took place during the 20th century, according to an ambitious, the Artenisi Tower and the Riccadonna Tower at the Mercato di mezzo were demolished in 1917. Of the numerous towers originally present, fewer than twenty can still be seen today, the construction of the towers was quite onerous, the usage of serfs notwithstanding. To build a tower with a height of 60 m would have required between three and 10 years of work. Each tower had a square cross-section with foundations between five and ten meters deep, reinforced by poles hammered into the ground and covered with pebble, the towers base was made of big blocks of selenite stone. Usually, some holes were left in the wall as well as bigger hollows in the selenite to support scaffoldings and to allow for later coverings and constructions. He based his analysis mostly on the archives of real estate deeds. His approach resulted in the number of 180 towers, an enormous amount considering the size. More recent estimates reduced therefore the number to a total between 80 and 100, where not all existed at the same time. They are located at the intersection of the roads lead to the five gates of the old ring wall. It was located at the site of the early medieval Gate to the Via Emilia, the taller tower is called the Asinelli while the smaller but more leaning tower is called the Garisenda. Le torri di Bologna, quando e perché sorsero, come vennero costruite, chi le innalzò, come scomparvero, associazione Guglielmo Marconi, Le due Torri Google Map view of the two towers
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Bologna
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Bologna is the largest city of the Emilia-Romagna Region in Northern Italy. It is the seventh most populous city in Italy, located in the heart of an area of about one million. The first settlements back to at least 1000 BC. The city has been a centre, first under the Etruscans. Home to the oldest university in the world, University of Bologna, founded in 1088, Bologna is also an important transportation crossroad for the roads and trains of Northern Italy, where many important mechanical, electronic and nutritional industries have their headquarters. According to the most recent data gathered by the European Regional Economic Growth Index of 2009, Bologna is the first Italian city, Bologna is home to numerous prestigious cultural, economic and political institutions as well as one of the most impressive trade fair districts in Europe. In 2000 it was declared European capital of culture and in 2006, the city of Bologna was selected to participate in the Universal Exposition of Shanghai 2010 together with 45 other cities from around the world. Bologna is also one of the wealthiest cities in Italy, often ranking as one of the top cities in terms of quality of life in the country, after a long decline, Bologna was reborn in the 5th century under Bishop Petronius. According to legend, St. Petronius built the church of S. Stefano. After the fall of Rome, Bologna was a stronghold of the Exarchate of Ravenna in the Po plain. In 728, the city was captured by the Lombard king Liutprand, the Germanic conquerors formed a district called addizione longobarda near the complex of S. Stefano. Charlemagne stayed in this district in 786, traditionally said to be founded in 1088, the University of Bologna is widely considered to be the first university. The university originated as a centre of study of medieval Roman law under major glossators. It numbered Dante, Boccaccio and Petrarca among its students, the medical school is especially famous. In the 12th century, the families engaged in continual internecine fighting. Troops of Pope Julius II besieged Bologna and sacked the artistic treasures of his palace, in 1530, in front of Saint Petronio Church, Charles V was crowned Holy Roman Emperor by Pope Clement VII. Then a plague at the end of the 16th century reduced the population from 72,000 to 59,000, the population later recovered to a stable 60, 000–65,000. However, there was also great progress during this era, in 1564, the Piazza del Nettuno and the Palazzo dei Banchi were built, along with the Archiginnasio, the centre of the University
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Florence
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Florence is the capital city of the Italian region of Tuscany and of the Metropolitan City of Florence. It is the most populous city in Tuscany, with 383,083 inhabitants, Florence was a centre of medieval European trade and finance and one of the wealthiest cities of the time. It is considered the birthplace of the Renaissance, and has called the Athens of the Middle Ages. A turbulent political history includes periods of rule by the powerful Medici family, from 1865 to 1871 the city was the capital of the recently established Kingdom of Italy. The Historic Centre of Florence attracts 13 million tourists each year and it was declared a World Heritage Site by UNESCO in 1982. The city is noted for its culture, Renaissance art and architecture, the city also contains numerous museums and art galleries, such as the Uffizi Gallery and the Palazzo Pitti, and still exerts an influence in the fields of art, culture and politics. Due to Florences artistic and architectural heritage, it has been ranked by Forbes as one of the most beautiful cities in the world, in 2008, the city had the 17th highest average income in Italy. Florence originated as a Roman city, and later, after a period as a flourishing trading and banking medieval commune. According to the Encyclopædia Britannica, it was politically, economically, and culturally one of the most important cities in Europe, the language spoken in the city during the 14th century was, and still is, accepted as the Italian language. Starting from the late Middle Ages, Florentine money—in the form of the gold florin—financed the development of all over Europe, from Britain to Bruges, to Lyon. Florentine bankers financed the English kings during the Hundred Years War and they similarly financed the papacy, including the construction of their provisional capital of Avignon and, after their return to Rome, the reconstruction and Renaissance embellishment of Rome. Florence was home to the Medici, one of European historys most important noble families, Lorenzo de Medici was considered a political and cultural mastermind of Italy in the late 15th century. Two members of the family were popes in the early 16th century, Leo X, catherine de Medici married king Henry II of France and, after his death in 1559, reigned as regent in France. Marie de Medici married Henry IV of France and gave birth to the future king Louis XIII, the Medici reigned as Grand Dukes of Tuscany, starting with Cosimo I de Medici in 1569 and ending with the death of Gian Gastone de Medici in 1737. The Etruscans initially formed in 200 BC the small settlement of Fiesole and it was built in the style of an army camp with the main streets, the cardo and the decumanus, intersecting at the present Piazza della Repubblica. Situated along the Via Cassia, the route between Rome and the north, and within the fertile valley of the Arno, the settlement quickly became an important commercial centre. Peace returned under Lombard rule in the 6th century, Florence was conquered by Charlemagne in 774 and became part of the Duchy of Tuscany, with Lucca as capital. The population began to again and commerce prospered