Box girder bridge
| 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 |
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.