Analysis of localization of plastic buckling patterns under cyclic loading

摘要

It has been observed in experiments that the localization of plastic buckling patterns has a large influence on the strength deterio- ration of steel structures under cyclic Ioading. In this study the theoretical aspects of this cyclic localization phenomenon were investigated. The localization behavior is caused by a plastic bifur- cation on the decreasing equilibrium path subsequent to the maximum load point. Thus, we first show a precise numerical method based on the finite element method for analysis of the plas- tic bifurcation. Then, using this method, we examine the localiz- ation behavior of cylindrical shells and plates under cyclic loading. Specifically, we investigate the effect of structural parameters and that of constitutive models on the strength deterioration.