Elasto-plastic response of steel bridge pier base joint under seismic loading

Abstract In this study, the elasto-plastic response of a who le structure, including both superstructures and substructures, was estimated by means of dynamic el asto-plastic finite element analysis, and the elast o-plastic strain history at the top end of triangular ribs wa s estimated by means of static elasto-plastic finit e element analysis using the results obtained by dynamic elas to-plastic finite element analysis. As a result, di splacement response of the steel bridge pier can be estimated by means of dynamic elasto-plastic finite element a nalysis. The maximum displacement response δmax is 207mm and the minimum displacement response δmin is -291mm at the top of column in the case of a 0.03 damping coeffic i nt. By means of static elasto-plastic finite eleme nt analysis, it was shown that there was a possibility that the maximum strain range ( ∆εymax) can exceed 20% at the top end of triangular ribs.