For modern truss bridges, gusset plate connections are generally used, then bending moments and shear forces of members should be considered for evaluating the real performance of the truss bridges, which is achieved by the aid of finite element software. Therefore, the truss members like chords, verticals, and diagonals act only in either tension or compression. In order to simplify the calculation, trusses are generally assumed as pinned connection between adjacent truss members. Truss bridges are one of the oldest types of modern bridges. Truss is a structure of connected elements forming triangular units, and a bridge whose load-bearing superstructure is composed of a truss is a truss bridge. Weiwei Lin, Teruhiko Yoda, in Bridge Engineering, 2017 1.3.8.3 Truss Bridges
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