1.
Cantilever (figure skating)
–
The cantilever is a figure skating element. Similar to the eagle, the skater travels along a deep edge. With knees bent, the skater bends his or her back backwards and it was invented by Werner Groebli, better known as Mr. Frick, a long-time show skater with Ice Follies. More recently, it one of Ilia Klimkins signature moves
2.
Truss
–
In engineering, a truss is a structure that consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object. A two-force member is a component where force is applied to only two points. In this typical context, external forces and reactions to those forces are considered to act only at the nodes and result in forces in the members that are either tensile or compressive. For straight members, moments are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes, as is necessary for the links to be two-force members. A planar truss is one all members and nodes lie within a two dimensional plane, while a space truss has members and nodes that extend into three dimensions. The top beams in a truss are called top chords and are typically in compression, the beams are called bottom chords. The interior beams are called webs, and the areas inside the webs are called panels, Truss derives from the Old French word trousse, from around 1200, which means collection of things bound together. The term truss has often used to describe any assembly of members such as a cruck frame or a couple of rafters. One engineering definition is, A truss is a single plane framework of individual structural member connected at their ends of forms a series of triangle to span a large distance, a truss consists of typically straight members connected at joints, traditionally termed panel points. Trusses are typically composed of triangles because of the stability of that shape. A triangle is the simplest geometric figure that will not change shape when the lengths of the sides are fixed, in comparison, both the angles and the lengths of a four-sided figure must be fixed for it to retain its shape. The joint at which a truss is designed to be supported is commonly referred to as the Munter Point, the simplest form of a truss is one single triangle. This type of truss is seen in a roof consisting of rafters and a ceiling joist. Because of the stability of this shape and the methods of used to calculate the forces within it. The traditional diamond-shape bicycle frame, which utilizes two conjoined triangles, is an example of a simple truss, a planar truss lies in a single plane. Planar trusses are used in parallel to form roofs and bridges. The depth of a truss, or the height between the upper and lower chords, is what makes it an efficient structural form, a solid girder or beam of equal strength would have substantial weight and material cost as compared to a truss. For a given span, a deeper truss will require less material in the chords, an optimum depth of the truss will maximize the efficiency
3.
Post and lintel
–
In architecture, post and lintel is a building system where strong horizontal elements are held up by strong vertical elements with large spaces between them. This is usually used to hold up a roof, creating an open space beneath. The horizontal elements are called by a variety of names including lintel, header, architrave or beam, the use of wider elements at the top of the post, called capitals, to help spread the load, is common to many traditions. The trabeated system is a principle of Neolithic architecture, Ancient Indian architecture, Ancient Greek architecture. Other trabeated styles are the Persian, Lycian, Japanese, traditional Chinese, and ancient Chinese architecture, especially in northern China, the traditions are represented in North and Central America by Mayan architecture, and in South America by Inca architecture. In all or most of these traditions, certainly in Greece and India, the earliest versions developed using wood, timber framing, also using trusses, remains common for smaller buildings such as houses to the modern day. The biggest disadvantage to a post and lintel construction is the weight that can be held up. Ancient Roman architectures development of the allowed for much larger structures to be constructed. As with the Roman temple portico front and its descendents in later classical architecture, the classical orders of Greek origin were in particular retained in buildings designed to impress, even though they usually had little or no structural role. In architecture, a post-and-lintel or trabeated system refers to the use of horizontal beams or lintels which are borne up by columns or posts, the name is from the Latin trabs, beam, influenced by trabeatus, clothed in the trabea, a ritual garment. In India the style was used originally for wooden construction, but later the technique was adopted for stone structures for decorated load-bearing, post and lintel construction is one of four ancient structural methods of building, the others being the corbel, arch-and-vault, and truss. The two posts are under compression from the weight of the lintel above, the lintel will deform by sagging in the middle because the underside is under tension and the topside is under compression
4.
Cantilever bridge
–
A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end. Engineers in the nineteenth century understood that a bridge that was continuous across multiple supports would distribute the loads among them and this would result in lower stresses in the girder or truss and meant that longer spans could be built. Several nineteenth century engineers patented continuous bridges with hinge points mid-span, the use of a hinge in the multi-span system presented the advantages of a statically determinate system and of a bridge that could handle differential settlement of the foundations. Engineers could more easily calculate the forces and stresses with a hinge in the girder, heinrich Gerber was one of the engineers to obtain a patent for a hinged girder and is recognized as the first to build one. The Hassfurt Bridge over the Main river in Germany with a span of 124 feet was completed in 1867 and is recognized as the first modern cantilever bridge. The High Bridge of Kentucky by C, the Kentucky River Bridge spanned a gorge that was 275 feet deep and took full advantage of the fact that falsework, or temporary support, is not needed for the main span of a cantilever bridge. The most famous early cantilever bridge is the Forth Bridge and this bridge held the record for longest span in the world for seventeen years, until it was surpassed by the Quebec Bridge. Benjamin Baker illustrated the principles of the suspended span cantilever in the photo on the left. The suspended span, where Kaichi Watanabe sits, is seen in the center, the need to resist compression of the lower chord is seen in the use of wooden poles while the tension of the upper chord is shown by the outstretched arms. The action of the foundations as anchors for the cantilever is visible in the placement of the counterweights. A simple cantilever span is formed by two arms extending from opposite sides of an obstacle to be crossed, meeting at the center. In a common variant, the span, the cantilever arms do not meet in the center, instead. The suspended span may be built off-site and lifted into place, thus, in a bridge built on two foundation piers, there are four cantilever arms, two which span the obstacle, and two anchor arms which extend away from the obstacle. Because of the need for strength at the balanced cantilevers supports. The Commodore Barry Bridge is an example of type of cantilever bridge. Steel truss cantilevers support loads by tension of the upper members, commonly, the structure distributes the tension via the anchor arms to the outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are statically determinate with no members carrying mixed loads. Prestressed concrete balanced cantilever bridges are built using segmental construction
5.
Balcony
–
A balcony is a platform projecting from the wall of a building, supported by columns or console brackets, and enclosed with a balustrade, usually above the ground floor. The traditional Maltese balcony is a closed balcony projecting from a wall. By contrast, a Juliet balcony does not protrude out of the building and it is usually part of an upper floor, with a balustrade only at the front, like a small Loggia. Modern Juliet balconies often involve a metal barrier placed in front of a window which can be opened. Sometimes balconies are adapted for ceremonial purposes, e. g. that of St. Peters Basilica at Rome, inside churches, balconies are sometimes provided for the singers, and in banqueting halls and the like for the musicians. A unit with a regular balcony will have doors that open up onto a patio with railings. A French balcony is actually a false balcony, with doors that open to a railing with a view of the courtyard or the surrounding scenery below. In theatres, the balcony was formerly a stage-box, but the name is now confined to the part of the auditorium above the dress circle. One of the most famous uses of a balcony is in traditional stagings of the scene that has come to be known as the scene in William Shakespeares tragedy, Romeo. Manufacturers names for their balcony designs often refer to the origin of the design, italian balcony, Spanish balcony, Mexican balcony, Ecuadorian balcony
6.
Corbel
–
In architecture a corbel is a structural piece of stone, wood or metal jutting from a wall to carry a superincumbent weight, a type of bracket. A corbel is a piece of material in the wall. A piece of projecting in the same way was called a tassel or a bragger in the UK. The technique of corbelling, where rows of corbels deeply keyed inside a support a projecting wall or parapet, has been used since Neolithic, or New Stone Age. A console is more specifically an S-shaped scroll bracket in the classical tradition, keystones are also often in the form of consoles. Whereas corbel is rarely used outside architecture, console is used for furniture, as in console table. The word corbel comes from Old French and derives from the Latin corbellus, a diminutive of corvus, similarly, the French refer to a bracket-corbel, usually a load-bearing internal feature, as a corbeau. Norman corbels often have an appearance, although they may be elaborately carved with stylised heads of humans, animals or imaginary beasts. Similarly, in the Early English period, corbels were sometimes carved, as at Lincoln Cathedral. Corbels sometimes end with a point apparently growing into the wall, or forming a knot, in the later periods the carved foliage and other ornaments used on corbels resemble those used in the capitals of columns. Throughout England, in work, wooden corbels abound, carrying window-sills or oriel windows in wood. The corbels carrying balconies in Italy and France were sometimes of great size and richly carved, taking a cue from 16th-century practice, the Paris-trained designers of 19th-century Beaux-Arts architecture were encouraged to show imagination in varying corbels. A corbel table is a moulded string course supported by a range of corbels. Sometimes these corbels carry a small arcade under the string course, as a rule the corbel table carries the gutter, but in Lombard work the arcaded corbel table was utilized as a decoration to subdivide the storeys and break up the wall surface. In Italy sometimes over the corbels will form a moulding, in modern chimney construction, a corbel table is constructed on the inside of a flue in the form of a concrete ring beam supported by a range of corbels. The corbels can be either in-situ or pre-cast concrete, the corbel tables described here are built at approximately ten metre intervals to ensure stability of the barrel of refractory bricks constructed thereon. In medieval architecture the technique was used to support upper storeys or a parapet projecting forward from the wall plane and this later became a decorative feature, without the openings. Corbelling supporting upper stories and particularly supporting projecting corner turrets subsequently became a characteristic of the Scottish baronial style, medieval timber-framed buildings often employ jettying, where upper stories are cantilevered out on projecting wooden beams in a similar manner to corbelling
7.
Scotland
–
Scotland is a country that is part of the United Kingdom and covers the northern third of the island of Great Britain. It shares a border with England to the south, and is surrounded by the Atlantic Ocean, with the North Sea to the east. In addition to the mainland, the country is made up of more than 790 islands, including the Northern Isles, the Kingdom of Scotland emerged as an independent sovereign state in the Early Middle Ages and continued to exist until 1707. By inheritance in 1603, James VI, King of Scots, became King of England and King of Ireland, Scotland subsequently entered into a political union with the Kingdom of England on 1 May 1707 to create the new Kingdom of Great Britain. The union also created a new Parliament of Great Britain, which succeeded both the Parliament of Scotland and the Parliament of England. Within Scotland, the monarchy of the United Kingdom has continued to use a variety of styles, titles, the legal system within Scotland has also remained separate from those of England and Wales and Northern Ireland, Scotland constitutes a distinct jurisdiction in both public and private law. Glasgow, Scotlands largest city, was one of the worlds leading industrial cities. Other major urban areas are Aberdeen and Dundee, Scottish waters consist of a large sector of the North Atlantic and the North Sea, containing the largest oil reserves in the European Union. This has given Aberdeen, the third-largest city in Scotland, the title of Europes oil capital, following a referendum in 1997, a Scottish Parliament was re-established, in the form of a devolved unicameral legislature comprising 129 members, having authority over many areas of domestic policy. Scotland is represented in the UK Parliament by 59 MPs and in the European Parliament by 6 MEPs, Scotland is also a member nation of the British–Irish Council, and the British–Irish Parliamentary Assembly. Scotland comes from Scoti, the Latin name for the Gaels, the Late Latin word Scotia was initially used to refer to Ireland. By the 11th century at the latest, Scotia was being used to refer to Scotland north of the River Forth, alongside Albania or Albany, the use of the words Scots and Scotland to encompass all of what is now Scotland became common in the Late Middle Ages. Repeated glaciations, which covered the land mass of modern Scotland. It is believed the first post-glacial groups of hunter-gatherers arrived in Scotland around 12,800 years ago, the groups of settlers began building the first known permanent houses on Scottish soil around 9,500 years ago, and the first villages around 6,000 years ago. The well-preserved village of Skara Brae on the mainland of Orkney dates from this period and it contains the remains of an early Bronze Age ruler laid out on white quartz pebbles and birch bark. It was also discovered for the first time that early Bronze Age people placed flowers in their graves, in the winter of 1850, a severe storm hit Scotland, causing widespread damage and over 200 deaths. In the Bay of Skaill, the storm stripped the earth from a large irregular knoll, when the storm cleared, local villagers found the outline of a village, consisting of a number of small houses without roofs. William Watt of Skaill, the laird, began an amateur excavation of the site, but after uncovering four houses
8.
Timber framing
–
Timber framing and post-and-beam construction are methods of building with heavy timbers rather than dimensional lumber such as 2x4s. Traditional timber framing is the method of creating structures using heavy squared-off and it is commonplace in wooden buildings from the 19th century and earlier. The method comes from making out of logs and tree trunks without modern high tech saws to cut lumber from the starting material stock. Since this building method has been used for thousands of years in parts of the world. These styles are categorized by the type of foundation, walls, how and where the beams intersect, the use of curved timbers. Three basic types of frames in English-speaking countries are the box frame, cruck frame. The distinction presented here is the load is carried by the exterior walls. Purlins are also in a timber frame. A cruck is a pair of crooked or curved timbers which form a bent or crossframe, more than 4,000 cruck frame buildings have been recorded in the UK. Several types of frames are used, more information follows in English style below. True cruck or full cruck, blades, straight or curved, base cruck, tops of the blades are truncated by the first transverse member such as by a tie beam. Raised cruck, blades land on masonry wall, and extend to the ridge, middle cruck, blades land on masonry wall, and are truncated by a collar. Upper cruck, blades land on a tie beam, very similar to knee rafters, jointed cruck, blades are made from pieces joined near eaves in a number of ways. See also, hammerbeam roof End cruck is not a style, aisled frames have one or more rows of interior posts. These interior posts typically carry more load than the posts in the exterior walls. This is the concept of the aisle in church buildings, sometimes called a hall church. However, a nave is often called an aisle, and three-aisled barns are common in the U. S. the Netherlands, aisled buildings are wider than the simpler box-framed or cruck-framed buildings, and typically have purlins supporting the rafters. In northern Germany, this construction is known as variations of a Ständerhaus, the frame is often left exposed on the exterior of the building
9.
Jettying
–
Jettying is a building technique used in medieval timber-frame buildings in which an upper floor projects beyond the dimensions of the floor below. This has the advantage of increasing the space in the building without obstructing the street. Jettied floors are also termed jetties, in the U. S. the most common surviving colonial version of this is the garrison house. Most jetties are external, but some early Medieval houses were built with internal jetties, a jetty is an upper floor that depends on a cantilever system in which a horizontal beam, the jetty bressummer, supports the wall above and projects forward beyond the floor below. The bressummer itself rests on the ends of a row of jetty beams or joists which are supported by jetty plates, jetty joists in their turn were slotted sideways into the diagonal dragon beams at angle of 45° by means of mortise and tenon joints. The overhanging corner posts are often reinforced by curved jetty brackets, the origins of jettying is unclear but some reasons put forward for their purpose are, To gain space. The structural advantage of the jettied wall counteracting forces in the joists or tying a stone wall together To shelter the walls of the house from the weather. Uses shorter timbers, a due to timber shortages and difficult handling of long timbers especially in city streets. As a status symbol or. symbol of wealth and status, jetties were popular in the 16th century but banned in Rouen in 1520 relating to air circulation and the plague, and London in 1667 relating to the great fire. They are considered a Gothic style, structurally, jetties are of several types, Framed on multiple joists. Framed on brackets added to the posts, hewn jetty also called a false jetty, Framed on projections of the posts rather than on cantilevered beams. The less substantial studs of the close studding along the walls above, the jetty beams are morticed at 45° into the sides of the dragon beams. They are the constituents of the cantilever system and they determine how far the jetty projects the jetty-plates. The jetty-plate itself is supported by the posts of the recessed floor below. Jettying was used for timber-framed buildings, but was succeeded by cantilever which are used for the reason as jettying. This is often utilised on buildings which are on a narrow plot, the Pennsylvania barn in the U. S. has a distinctive cantilever called a forebay, not a jetty. The traditional Turkish house is a house with a cantilevered or supported overhang called a cumba. The House of Opus Craticum built before 79 A. D. in Roman Herculaneum has a supported cantilever, cantilever – modern buildings still use cantilevered floors, but the term jettying is rarely used
10.
Pennsylvania barn
–
A Pennsylvania barn is a type of banked barn built in the US from about 1790 to 1900. The styles most distinguishing feature is the presence of an overshoot or forebay and these barns were banked, that is set into a hillside to ensure easy access to both the basement and the level above. Almost all Pennsylvania barns have gable roofs, but the forebay, barn scholar Robert Ensminger classified the Pennsylvania barn into three types, Standard Pennsylvania, Sweitzer, and Extended Pennsylvania barns. The Pennsylvania style barns were built west of Pennsylvania and in Canada. The Standard Pennsylvania barn is the most numerous and widely distributed class of the Pennsylvania barns and these were built between 1790 and 1890. The key characteristic in identifying this type is the forebay is built in a way that the end is symmetrical with both front and rear walls being the same height. Sweitzer barns are known as Swetzer or Swisser. The name reflects the barns probable origin from Switzerland, the Sweitzer is the original Pennsylvania barn and was originally a log crib-type barn built between 1730 and 1850. The distinguishing feature of type of forebay barn is that the forebay projects in a way that the gable end is asymmetrical
11.
Log cabin
–
A log cabin is a dwelling constructed of logs, especially a less finished or architecturally sophisticated structure. Log cabins have an ancient history in Europe, and in America are often associated with first generation home building by settlers, construction with logs was described by Roman architect Vitruvius Pollio in his architectural treatise De Architectura. He noted that in Pontus, dwellings were constructed by laying logs horizontally overtop of each other and filling in the gaps with chips, historically log cabin construction has its roots in Scandinavia and Eastern Europe. Although their origin is uncertain, the first log structures were probably being built in Northern Europe by the Bronze Age. C. A. Weslager describes Europeans as having. accomplished in building several forms of log housing, having different methods of corner timbering, Log saunas or bathhouses of this type are still found in rural Finland. By stacking tree trunks one on top of another and overlapping the logs at the corners and they developed interlocking corners by notching the logs at the ends, resulting in strong structures that were easier to make weather-tight by inserting moss or other soft material into the joints. As the original coniferous forest extended over the coldest parts of the world, the insulating properties of the solid wood were a great advantage over a timber frame construction covered with animal skins, felt, boards or shingles. Over the decades, increasingly complex joints were developed to ensure more weather tight joints between the logs, but the profiles were still based on the round log. It was also common to replace individual logs damaged by dry rot as necessary, the Wood Museum in Trondheim, Norway, displays fourteen different traditional profiles, but a basic form of log construction was used all over North Europe and Asia and later imported to America. Log construction was especially suited to Scandinavia, where straight, tall tree trunks are readily available, with suitable tools, a log cabin can be erected from scratch in days by a family. As no chemical reaction is involved, such as hardening of mortar, many older towns in Northern Scandinavia have been built exclusively out of log houses, which have been decorated by board paneling and wood cuttings. Today, construction of log cabins as leisure homes is a fully developed industry in Finland. Modern log cabins often feature fiberglass insulation and are sold as prefabricated kits machined in a factory, Log cabins are mostly constructed without the use of nails and thus derive their stability from simple stacking, with only a few dowel joints for reinforcement. This is because a log cabin tends to compress slightly as it settles, nails would soon be out of alignment and torn out. In the present-day United States, settlers may have first constructed log cabins by 1638, historians believe that the first log cabins built in North America were in the Swedish colony of Nya Sverige in the Delaware River and Brandywine River valleys. Many of its colonists were actually Forest Finns, because Finland was a part of Sweden at that time. New Sweden only briefly existed before it became the Dutch colony of New Netherland, the Swedish-Finnish colonists quick and easy construction techniques not only remained, but spread. Later German and Ukrainian immigrants also used this technique, the Scots and Scots-Irish had no tradition of building with logs, but they quickly adopted the method
12.
Falsework
–
This usage is specifically called centering. The British Standards of practice for falsework, BS5975,1982, until the turn of the 20th century almost all falsework was constructed from timber. To compensate for shortages in different regions and to rationalize labor and material usage. The major developments include the design of devices, transitions to other spanning beams such as steel pipes or profiles or reusable timber beams. During the same period many different scaffolding systems were being developed around the world and these consisted of welded frames that could be slotted or clipped together to form access or support towers. The reduction in time and complexity led to reduced labor costs. Further developments have made scaffolding systems even easier to use, stronger systems have been introduced that either incorporate horizontal restraints at more levels or use stronger tubes or connections. Materials from which falsework systems are manufactured have also diversified from traditional steel, in the UK, BS5975 gives recommendations for the design and use of falsework on construction sites. It was first introduced by the British Standards Institute in March 1982 and was revised in March 1996. The code is currently under revision again, a copy was released in late 2007. Fabrication, Metalworkers fabricate a falsework section from pipe and beams, erection, A section is lifted to a vertical position with the assistance of two forklift operators. Placement, The section is guided into position by a ground crew, completed Falsework, Decking and some formwork has been added. When the supports are complete, wood beams and plywood or reusable metal forms will be placed, reinforcing and tenon conduits added, after curing and any tenon tensioning, wedges will be removed and forms and falsework disassembled. A certain type of bridge, the suspension bridge, must be supported during construction
_cantilever_in_Scanning_Electron_Microscope,_magnification_1000x.GIF)
