a bridge with span structures whose basic bearing components are beams or truss girders, which are subjected to bending.

Girder bridges are differentiated as simple beam span structures, which rest (each on one end) on two piers, and continuous beam span structures, which rest on three or more piers. Girder bridges may have main girders with solid cross sections or main trussed girders. The span structures of girder bridges are made of steel, reinforced concrete, or wood. Bridges built with solid-section beams are usually deck bridges. Bridges with trussed girders are frequently through bridges. In modern bridge building girder bridges are the most widely used.