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A girder bridge is a bridge that uses girders as the means of supporting its deck. [1] The two most common types of modern steel girder bridges are plate and box. [citation needed] The term "girder" is often used interchangeably with "beam" in reference to bridge design.
The Coronado Bay Bridge has the tallest box girder. Box girder bridges of shallow rectangular cross-section and aerofoil characteristics became extensively used in road bridges from the 1960s onwards, such as the Severn Bridge, being much lighter than the deeper truss-type girder construction used on previous bridges such as the Golden Gate Bridge.
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
In some cases, the plate girders may be formed in a Z-shape rather than I-shape. The first tubular wrought iron plate girder bridge was built in 1846-47 by James Millholland for the Baltimore and Ohio Railroad. [2] Plate girder bridges are suitable for short to medium spans and may support railroads, highways, or other traffic. Plate girders ...
The bridges are mostly of the box girder design and work with straight or constant curve shapes, with a constant radius. 15-to-30-metre (49 to 98 ft) box girder sections of the bridge deck are fabricated at one end of the bridge in factory conditions. Each section is manufactured in around one week.
The (non-modular) box girder bridge was a popular choice during the roadbuilding expansion of the 1960s, especially in the West, and many new bridge projects were in progress simultaneously. A serious blow to this use was a sequence of three serious disasters, when new bridges collapsed in 1970 ( West Gate Bridge and Cleddau Bridge ) and 1971 ...
The Barra Strait Bridge is a girder bridge design, consisting of steel girders with a reinforced concrete deck, supported on reinforced concrete piers. [8] The bridge incorporates a double leaf bascule section at its eastern end to permit the continued passage of marine traffic through the strait.
Bottom panel — Used as a brace for bridge girders. it is 6 ft 5 in (1.96 m) long, 2' 3" wide, 3' 7 3 ⁄ 8" high, weight 435 lb (197 kg). End taper panel — Used as a bottom brace between the junction panel and bankseat beam. is 13' 2 5 ⁄ 8" long, 2'4" wide, 1'6" high, and weight 600 lb (270 kg). It is one component that requires at least ...