Box girder bridge
Type of bridge / From Wikipedia, the free encyclopedia
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. Box girder bridges are commonly used for highway flyovers and for modern elevated structures of light rail transport. Although the box girder bridge is normally a form of beam bridge, box girders may also be used on cable-stayed and other bridges.
Quick Facts Ancestor, Related ...
Ancestor | Tubular bridge |
---|---|
Related | jetway, skyway |
Descendant | segmental bridge |
Carries | Pedestrians, automobiles, trucks, light rail, heavy rail |
Span range | Medium |
Material | Steel, reinforced concrete, prestressed concrete |
Movable | Possible |
Design effort | High |
Falsework required | Yes, if cast-in-place reinforced or prestressed concrete is used, which is typical for freeway overpasses |
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Zwillings-Hohlkasten_bzw._Twin_box_girder.svg/220px-Zwillings-Hohlkasten_bzw._Twin_box_girder.svg.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Erskine_Bridge.jpg/640px-Erskine_Bridge.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Swanport_Bridge.jpg/640px-Swanport_Bridge.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/94/PlateBoxFlyover.jpg/640px-PlateBoxFlyover.jpg)