Elasto-plastic behavior of steel-pipe pier models under lateral cyclic loading

摘要

In order to investigate the effect of radius-thickness ratio and an axial force on the maximum lateral loading capacity and ductility of steel-pipe bridge piers, lateral cyclic loading tests under a compressive axial load for steel-pipe pier models are carried out. And also, in order to establish a rational analysis method for the pipe piers under lateral cyclic loading, numerical analyses by means of an elasto-plastic large displacement finite element method (FEM) following three types of constitutive rules are carried out and compared with the experimental results. These rules are isotropic hardening rule, kinematic hardening rule, and three-surface model. From this study, following results are obtained: 1) the effects of radius-thickness ratio and an axial load on the maximum lateral loading capacity are small; 2) ductility can be increased by decreasing radius-thickness ratio and the axial load; and 3) the local buckling mode developed near the basement of pier model can be more rationally estimated by the FEM analysis following three-surface model than the other two rules.