Plastic Behaviour of a Steel Bridge Pier under Seismic Loading

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In this study, the elasto-plastic response of a whole structure, including both superstructures and substructures, was estimated by means of dynamic elasto-plastic finite element analysis, and the elasto-plastic strain history at the top end of triangular ribs was estimated by means of static elasto-plastic finite element analysis using the results obtained by dynamic elasto-plastic finite element analysis. As a result, displacement response of the steel bridge pier can be estimated by means of dynamic elasto-plastic finite element analysis. The maximum displacement response δ_<max> is 207mm and the minimum displacement response δ_<min> is -291mm at the top of column in the case of a 0.03 damping coefficient. By means of static elasto-plastic finite element analysis, it was shown that there was a possibility that the maximum strain range (Δε_<γ max>) can exceed 20% at the top end of triangular ribs.
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