Abstract
In this study, lateral two directional elasto-plastic earthquake response analyses with one-mass-system were conducted, which restoring force characteristics were elasto-perfectly plastic model and slipping model based on an analogy to the theory of plasticity. Peak displacement responses were examined with a view to its prediction by using equivalent linearization and elastic response spectrum. The model shown in this paper had the same initial natural period and yield strength in all the lateral direction. Therefore, anisotropic behaviors appeared in hysteresis loop in slipping model subjected to lateral two-directional cyclic loads. In this paper, two typical measured earthquake accelerations were adopted in calculations. As a result, a possibility was shown that the peak displacement responses in those two models were predicted within the same degree of precision by estimating substitute damping in each model.
