Bridges And Their Types Bridges

1467 Words Mar 28th, 2016 6 Pages
BRIDGES AND THEIR TYPES
Highway Bridges
Bridges are an essential part of the transport infrastructure.
General Information:
A bridge is a means by which a road, railway or other service is carried over an obstacle such as a river, valley, and other road or railway line, either with no intermediate support or with only a limited number of supports at convenient locations. Fig: Docklands Light Rail Bridge, London, England.
Basic features of bridges:
Superstructure
`The superstructure of a bridge is the part directly responsible for carrying the road or other service. Its layout is determined largely by the disposition of the service to be carried. In most cases, there is a deck structure that carries the loads from the individual wheels and distributes the loads to the principal structural elements, such as beams spanning between the substructure supports.
Road bridges carry a number of traffic lanes, in one or two directions, and may also carry footways. At the edge of the bridge, parapets are provided for the protection of vehicles and people.
Rail bridges typically carry two tracks, laid on ballast, although separate superstructures are often provided for each track. They are narrow (about 2m wide) and are usually single span structures that rarely span more than 40m.
Substructure:
The substructure of a bridge is responsible for supporting the superstructure and carrying the loads to the ground through foundations. To support the superstructure, single span bridges…

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