Journals Proceedings

Abstract

In this paper, the nonlinear dynamic behavior of clayey soil using 2D finite element analyses is presented. This paper presents comparative analyses of seismic response by different numerical approaches. The behavior of two types of soil represented the soft and stiff clay is investigated under effect of three different acceleration time histories. The amplification functions of seismic signals obtained by 1D equivalent linear viscoelastic analyses performed in the frequency domain is used to evaluate the initial values of Rayleigh damping (R and R) coefficients to perform the nonlinear finite element analyses. The influences of type of soil and peak ground acceleration on the nonlinear dynamic behavior of soil are studied. The results show a contraction of peak ground acceleration profile and the spectra as compared to the equivalent linear analysis especially in the uppermost portion of the deposit. The rate of increase of shear strain during ground shaking and the permanent shear strain increases as increase of peak ground acceleration for soft soil and linearly for stiff clay. The results obtained by the results indicate that the equivalent linear analysis should not be considered as a right way to modeling strong motion earthquakes especially for soft clay deposit.