Steel bridge refers to a bridge whose main load-bearing structure is made of steel, namely steel structure bridge or steel bridge. Prefabricated steel bridges have been widely used around the world. The main design concept is to assemble prefabricated steel bridges with the minimum number of types of unit components, capable of bearing various loads and spans, and only requiring general medium-sized truck transportation. In special cases, it can be built entirely by manpower. The main load-bearing structure adopts rigid frame bridges. The beam and leg or pier (platform) body form a rigid connection. The structural forms can be divided into portal rigid frame bridges, inclined leg rigid frame bridges, T-shaped rigid frame bridges, and continuous rigid frame bridges.