To assess critical state of bridges, after-fracture-redundancy plays an important role. Therefore, it is necessary to make a correct prediction of redundancy. However, redundancy from numerical analysis is strongly influenced by various analytical conditions. This study aimed to clarify the influence of member connection modeling and shape of gusset plates on redundancy analysis of truss bridges. Redundancy were computed for three types of analysis model of truss bridge. Model A was a frame model of truss bridge, frame members were connected to each other rigidly as it is. On the other hand, in Model B and Model C, members were connected via gusset plates modeled by shell elements. Gusset plates in model B were rectangle and these of model C had curved shape. Using these three models, redundancies under different analytical condition and different gusset plate shape were compared. From the results of calculation, it was found that bending moment on truss members were strongly influenced by difference of member connection modeling. Computed results also indicated that the influence appears more strongly in damage state than normal state (non-damage state). This result suggested the necessity of accurate modeling of member connection. Furthermore, it was indicated that the redundancy of truss bridges could be improved by change in shape of gusset plates.
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