Well there are very few posts about bridges on net. i'd like to provide the info about the bridges to my blog's visitors.
"A bridge is a structure built over a river, seas, and so on, that allows people or vehicles to cross from one side to the other."
It is a structure which is used to span the physical obstacles like sea,rivers,etc.different designs will be used for construction of bridges that suits the topography of that particular place. Designs of bridges vary depending on the function of the bridge.
TYPES OF BRIDGES :
Classification of bridges depends on the structure and its functions bridges and by how the forces of tension, compression, bending, torsion and shear are distributed through their structure.
BEAM BRIDGE :
Beam bridges are horizontal beams supported at each end by substructure units and can be either simply supported when the beams only connect across a single span, or continuous when the beams are connected across two or more spans. When there are multiple spans, the intermediate supports are known as piers. The earliest beam bridges were simple logs that sat across streams and similar simple structures. In modern times, beam bridges can range from small, wooden beams to large, steel boxes.
TRUSS BRIDGE :
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss. This truss is a structure of connected elements forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.
CANTILEVER BRIDGE :
Cantilever bridges are those which gets it support on only from side.
Most cantilever bridges use a pair of continuous spans that extend from opposite sides of the supporting piers to meet at the center of the obstacle the bridge crosses. Cantilever bridges are constructed using much the same materials & techniques as beam bridges. The difference comes in the action of the forces through the bridge.
ARCH BRIDGE :
Arch bridges have abutments at each end. The weight of the bridge is thrust into the abutments at either side. The earliest known arch bridges were built by the Greeks, and include the Arkadiko Bridge.
TIED ARCH BRIDGES :
Tied arch bridges have an arch-shaped superstructure, but differ from conventional arch bridges. Instead of transferring the weight of the bridge and traffic loads into thrust forces into the abutments, the ends of the arches are restrained by tension in the bottom chord of the structure. They are also called bowstring arches.
SUSPENSION BRIDGES :
Suspension bridges are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams. The caissons or cofferdams are implanted deep into the floor of a lake or river. Sub-types include the simple suspension bridge, the stressed ribbon bridge, the underspanned suspension bridge, the suspended-deck suspension bridge, and the self-anchored suspension bridge.
CABLE STAYED BRIDGES :
These are just like suspension bridges which are held by cables from the towers of the bridge .The only difference is cable usage can be reduced in this bridge . And the towers holding the cables are proportionally higher.
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