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A box girder bridge, or box section bridge, is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section.
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.
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 old Britannia Bridge with train track inside the box-girder tunnel. Section of the original tubular Britannia Bridge The patent curved and tapered box girder jib of a Fairbairn steam crane A box girder or tubular girder (or box beam ) is a girder that forms an enclosed tube with multiple walls, as opposed to an êž®- or H-beam .
A cantilever is a rigid structural element that extends horizontally and is unsupported at one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.
The double-deck cable-stayed Kap Shui Mun Bridge in Hong Kong uses a Vierendeel truss. Opened in 1997, the lower deck carries both rail and traffic, with the lack of diagonal members in the cross section allowing vehicles to drive through the openings provided by the Vierendeel design.
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