Cantilever bridge
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.
The Pierre Pflimlin Bridge is a balanced cantilever made of concrete, shown here under construction. | |
| Ancestor | Beam bridge, truss bridge |
|---|---|
| Related | None |
| Descendant | Swing bridge |
| Carries | Pedestrians, automobiles, trucks, light rail, heavy rail |
| Span range | Medium |
| Material | Iron, structural steel, prestressed concrete |
| Movable | No |
| Design effort | Medium |
| Falsework required | Very little to none |
The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (460 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework.
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