Which type of bridge relies on the strength and rigidity of the arch structure?

An arch bridge relies on the strength and rigidity of its arch structure to support loads. The design of an arch bridge allows it to effectively transfer weight and forces to its supports, typically located at either end of the bridge. This arch action is crucial because it means that the bridge can carry heavy loads while utilizing a relatively small amount of material compared to other bridge types.

The curved shape of the arch converts vertical loads into horizontal forces, which are then transferred down into the ground at the abutments. This effectively allows the arch bridge to maintain stability and strength, even in the face of dynamic loads such as traffic or wind.

While suspension bridges rely on cables to support the load and cantilever bridges depend on cantilevered beams projecting from supports, and beam bridges simply distribute loads along their length, none of these designs specifically harness the inherent properties of an arch structure. This unique use of arch geometry allows arch bridges to be particularly efficient and aesthetically pleasing, making them a popular choice for many engineering projects.