Bridges Bridges An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust against abutments at either side. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are now typically used. Multiple arch bridges are seen in ancient Roman aqueducts. Arch bridges were first invented by the ancient Greeks, who built them out of stone. Later, the Romans used cement in their arch bridges. The Romans only used semicircular arches, but longer and thinner bridges are possible with elliptical arches or inverted catenary arches. Some of these bridges are still standing today. ...more on Wikipedia about "Arch bridge"
The Bailey bridge is a portable pre-fabricated truss bridge, designed for use by military engineering units to bridge up to 60 m (200 foot) gaps. It requires no special tools or heavy equipment for construction, the bridge elements are small enough to be carried in trucks, and the bridge is strong enough to carry tanks. It is considered one of the great examples of military engineering. ...more on Wikipedia about "Bailey bridge"
A bascule bridge is a drawbridge with a counterweight that continuously balances the span, or "leaf", throughout the entire upward swing in providing clearance for boat traffic. Bascule is a French term for seesaw and balance, and bascule bridges operate along the same principle. They are the most common type of movable bridge in existence because they open quickly and require relatively little energy to operate. ...more on Wikipedia about "Bascule bridge"
A beam bridge is a direct descendant of the log bridge now made from shallow steel "I" beams, box beams (hollow rectangular tubes), reinforced concrete, or post-tensioned concrete (concrete with tubes for cable tendons). It is frequently seen in pedestrian bridges and for highway overpasses and flyovers. As is its ancestor, this bridge is in structural terms the most simple of the many bridge types. ...more on Wikipedia about "Beam bridge"
A box girder bridge is a bridge commonly used for roadway flyovers and for modern elevated structures of light rail transport. They may be fabricated from post-stressed concrete or sheet steel plate. If of concrete, they may be cast in place using falsework supports, removed after completion, or may be prefabricated (as is usually the steel plate type) in a fabrication yard, then transported and emplaced using cranes. The latter method is often used in situation where access for construction is limited to times of light traffic, which may be detoured around the work area using only a limited number of lanes. ...more on Wikipedia about "Box girder bridge"
A bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. Designs may be built higher than otherwise needed in order to allow other traffic (particularly ship traffic) beneath. ...more on Wikipedia about "Bridge"
Bridge classification is a measure of the maximum weight that a bridge can withstand, i.e. the weight of the heaviest vehicle that can be allowed to cross it. It is expressed in tons. It depends on the structural strength of the bridge. Normally a safety margin of almost 100% is kept while determining the bridge classification (so if a bridge is classified as class 9, it can probably actually take 18 tons). ...more on Wikipedia about "Bridge Classification"
A bridge of boats is a temporary type of bridge which floats on the river instead of having permanent pillars. It is built by linking boats and the first and last being anchored to the shores. It was used as a military technique since ancient times, being the fastest method for an army to cross a river. ...more on Wikipedia about "Bridge of boats"
A bridge can play many roles in art, for example ...more on Wikipedia about "Bridges in art"
The Brisbane bridges are located in Brisbane, Queensland, Australia. ...more on Wikipedia about "Bridges of Brisbane"
A cable-stayed bridge is a bridge that consists of one or more pillars, with cables supporting the roadbed. There are two major classes of cable-stayed bridges, differentiated by how the cables are connected to the pillars. In a parallel attachment design, the cables are made nearly parallel by having the height of attachment on the pillar be similar to the distance from the pillar along the roadway. In a radial attachment design, the cables all connect to or pass over the top of the pillar. ...more on Wikipedia about "Cable-stayed bridge"
Canopy walkways are bridges between and in trees; mostly linked up with platforms inside or around the trees. They were originally intended as access to the upper regions of ancient forests for scientist who conduct canopy research. After they turned out to provide a limited one-dimensional access to the trees, they were abandoned for canopy cranes. Today they serve as eco tourist attractions. ...more on Wikipedia about "Canopy walkway"
A cantilever bridge is a form of bridge whereby the structure is supported using the technique of cantilevers. Unlike suspension bridges where the load is supported at either end of the bridge, the strength of a cantilever bridge comes from a structure or structures positioned towards the middle of the bridge. ...more on Wikipedia about "Cantilever bridge"
A cantilever spar cable-stayed bridge is a modern variation of the cable-stayed bridge. This design has been pioneered by the architect Santiago Calatrava. An example of this type is the Puente del Alamillo. In two of his designs the force distribution does not depend solely upon the cantilever action of the spar; the angle of the spar away from the bridge and the weight distribution in the spar serve to reduce the overturning forces applied to the footing of the spar. In contrast, in his swinging Puente de la Mujer design the spar reaches toward the cable supported deck and is counterbalanced by a structural tail. ...more on Wikipedia about "Cantilever spar cable-stayed bridge" It's time to think about www.shortopedia.com.
A clapper bridge is an ancient form of bridge found on the moors of Devon ( Dartmoor and Exmoor) and in other upland areas of the United Kingdom including Snowdonia and Anglesey. It is formed by large flat slabs of granite or schist supported on stone piers (across rivers), or resting on the banks of streams. According to the Dartmoor National Park, the word 'clapper' derives from an Anglo-Saxon word, 'cleaca', meaning 'bridging the stepping stones'. ...more on Wikipedia about "Clapper bridge"
A compression arch suspended-deck bridge is a bridge made from modern materials such as steel or reinforced concrete in which a compression arch rises above the deck. Cables connect the deck to the arch. ...more on Wikipedia about "Compression arch suspended-deck bridge"
The Concrete bridge only started to appear in the early 20th Century. Examples include ...more on Wikipedia about "Concrete bridge"
A covered bridge is a bridge with enclosed sides and a roof. They are often single-lane bridges. The bridges are frequently made out of wood. Newer ones are frequently made out of concrete or metal with glass sides. ...more on Wikipedia about "Covered bridge"
A curling bridge, a new type of bridge designed by the English designer Thomas Heatherwick, has recently (September 2004) been completed in London. This bridge consists of eight triangular sections hinged at the walkway level and connected above by two part links that may be collapsed toward the deck by hydraulic pistons. The bridge curls up to form an octagonal shape covering one half of the waterway's width at that point. ...more on Wikipedia about "Curling bridge"
A drawbridge is a type of movable bridge typically associated with the entrance of a castle, but the term is also used to describe modern bascule bridges and lift bridges. ...more on Wikipedia about "Drawbridge"
A fill trestle is a bridge that is built to provide a scaffolding for the construction of a fill or an earthen dam. Typically, the trestle is built across the valley and a railroad track is laid across the trestle. Specially designed side-dumping railroad cars filled with earth or gravel are pushed onto it and dumped, burying the trestle. Typically, a fill trestle is constructed out of wood which remains buried in the fill and eventually decomposes. Advances in construction technology, particularly the development of the dump truck, have rendered the fill trestle technique obsolete. ...more on Wikipedia about "Fill trestle"
A Folding bridge is a type of movable bridge. ...more on Wikipedia about "Folding bridge"
A footbridge is a bridge designed for pedestrians rather than vehicular traffic. An enclosed footbridge between two buildings is sometimes known as a skyway. ...more on Wikipedia about "Footbridge"
Inca Rope bridges were simple suspension bridges over canyons and gorges to provide access for the Inca Empire. Bridges of this type were suitable for use since the Inca people did not use wheeled transport and so the traffic was limited to pedestrians and livestock. These bridges were an intrinsic part on the Inca road system and are an excellent example of Inca innovation in engineering. They were frequently used by Chasqui runners delivering messages throughout the Inca Empire. ...more on Wikipedia about "Inca rope bridge"
In the field of road transport, an interchange is a road junction that utilizes grade separation, and one or more ramps, to permit traffic on at least one road to pass through the junction without crossing any other traffic stream. ...more on Wikipedia about "Interchange (road)"
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