Principles and Practice of Engineering (PE) Civil: Breadth Practice Exam

A truss bridge is specifically designed to utilize a framework of triangular units (trusses) to efficiently distribute loads across its structure. The triangular configuration in truss bridges allows them to handle tension and compression forces effectively, providing stability and strength. The load is transferred through the truss members, which work together to support the weight of traffic and other loads on the bridge.

In contrast, suspension bridges employ cables suspended between towers, with the load supported by these cables and the stiffness provided by the sloping cables and the vertical suspenders. This design differs fundamentally in its load distribution mechanism. Cable-stayed bridges also use cables to support the bridge deck, but they anchor the cables directly to towers, which changes how forces are transmitted compared to a truss structure. Arch bridges utilize a curved structure that transfers loads down into the supports, primarily through compression. Each of these bridge types has its method of load distribution, but the truss bridge is distinct for its use of trusses to evenly distribute forces throughout its design.