Abstract
Soil nonlinearity should be necessarily considered in the study of site effect, due to the soft sediments and the strong ground motion. In this paper, a new soil nonlinear model is developed and implemented into ABAQUS software, and the nonlinear seismic response of a 3D sedimentary basin is studied with the viscoelastic artificial boundary and equivalent input seismic loads. The proposed method is verified and validated by comparing the calculated results with those published in the literature as well as recorded data. The effect of shear wave velocity, ground motion intensity, and soil stratification on the basin's nonlinear seismic response are investigated extensively through parametric analysis. It is shown that the PGAs of the nonlinear basin are even larger than that of the linear basin in some observation points under low shear wave velocity, which should be emphasized. Compared with the linear basin, the dominant period of the nonlinear basin becomes longer to a certain degree. The peak acceleration amplification factor gets smaller with increasing ground motion intensities. It is possible to provide a reference to estimate earthquake risk and determine ground motion parameters based on these results.
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