HYSTERESIS MODEL OF STEEL MATERIAL FOR THE BUCKLINGRESTRAINED BRACE CONSIDERING THE STRAIN RATEDEPENDENCY

摘要

In this study, in order to clarify the hysteresis behavior of low yield strength steel considering the strainrate dependency, a series of dynamic and quasi-static loading test of low yield strength steel was carriedout. The main parameters of the test were strain rate and loading pattern. Experimental results weredivided into displacement dependence part and velocity dependence part. By dividing it into twocomponents and evaluating each component separately, it is possible to construct a hysteresis model thatis easily used for inelastic response analysis. The displacement dependence part of the hysteresis wasmodeled in poly-linear model, after it divided into skeleton part, Bauschinger part and skeleton part. Onthe other hand, the velocity dependence part of the hysteresis was also modeled as a function of the strainrate. The model was reflected the effect of the cumulative strain. Using these models, the hysteresisbehavior of low yield strength steel, which receives the dynamic loading, becomes be able to be simplyand accurately predicted.