Effect of Nonlinearity on the Dynamic Behavior of Pile Groups

Abstract eng:
The aim of this paper is to demonstrate the use of a hybrid method in studying the effect of nonlinearity on the seismic- behavior of the soil-pile system. The dynamic behavior of a 2*2 pile group, with a rigid pile cap is analyzed under strong ground motion. The nonlinear near-field is modeled using finite elements and the elastic far-field is modeled using a boundary finite element method – CIFECM (Consistent Infinitesimal Finite Element Cell Method). For the near-field, material-nonlinearity due to plasticity and strain hardening has been considered. The Hierarchical Single Surface (HiSS) model available in literature has been used for dealing with nonlinearity. The Hybrid Time-Frequency Domain (HTFD) method of iterative solution is used in conjunction with CIFECM to model the non-linearity and the unbounded nature of the medium respectively. The effect of material nonlinearity on seismic response of the soil-pile system is presented.

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