NUMERICAL ANALYSIS ON SEISMIC NONLINEAR RESPONSE OF SOIL COLUMN INDUCED BY BI-AXIAL SPECTRUM-COMPATIBLE WAVES

Abstract

In this study, we investigated the effect of trajectories of bi-directional accelerograms on nonlinear seismic response of 3D soil column. Seismic response analysis for 3D soil column model were conducted at frequency domain and time domain, as input four kinds of bi-directional accelerograms matching the same elastic response spectrum.
As a result, in frequency domain, the maximum response of soil column is almost the same value, irrespective of the difference in acceleration trajectory.On the other hand, in time domain, the maximum seismic response values of soil column are different for each acceleration trajectories. In particular, in case of circular trajectory, seismic nonlinear response tends to increase.