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Beam bridges are often only used for relatively short distances because, unlike truss bridges, they have no built in supports. The only supports are provided by piers. The further apart its supports, the weaker a beam bridge gets. As a result, beam bridges rarely span more than 250 feet (80 m).
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units.The connected elements, typically straight, may be stressed from tension, compression, or sometimes both in response to dynamic loads.
Truss bridge for a single-track railway, converted to pedestrian use and pipeline support. In this example the truss is a group of triangular units supporting the bridge. Typical detail of a steel truss, which is considered as a revolute joint Historical detail of a steel truss with an actual revolute joint
Arch bridge: 575 meters (Ping'nan Third Bridge, Guangxi, Southern China) Through arch bridge: Beam bridge (Integral beam bridge) [1] Log bridge (beam bridge) Viaduct: Cavity wall viaduct Bowstring arch: Box girder bridge: Cable-stayed bridge: 1,104 m (Russky Bridge, Vladivostok, Primorsky Krai, Russian Far East) 10,100 m (Jiashao Bridge ...
In truss and arch-style bridges, the girders are still the main support for the deck, but the load is transferred through the truss or arch to the foundation. These designs allow bridges to span larger distances without requiring the depth of the beam to increase beyond what is practical.
Beam bridges are the simplest and oldest type of bridge in use today, [31] and are a popular type. [32] 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 Braga Bridge is a continuous truss bridge. It was the fourth longest span of this type when it was completed in 1966. This list of continuous bridge spans ranks the world's continuous truss bridges in two listings: The first is ranked by the length of main span (the longest length of unsupported roadway) and the second by the total length of continuous truss spans.
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.