Cyclic behavior and ductility evaluation of thin-walled stiffened steel box columns

摘要

This paper deals with cyclic behavior and ductility evaluation of thin-walled stiffened steel box columns subjected to cyclic lateral loading in the presence of constant axial load. The basic characteristics of steel box columns are noted. The results of finite-element analyses on cyclic elastoplastic behavior of steel box columns are presented. For comparison purposes, in the analysis three material models are employed for material nonlinearity to trace the inelastic cyclic behavior of steel: kinematic hardening, isotropic hardening, and elastic perfectly plastic. A method for evaluating ductility capacity of tubular columns is presented. The application of the method is demonstrated by comparing the computed strength and ductility of some cantilever columns with the test results.