In this paper, a series of numerical analyses using dynamic finite element method are conducted to investigate the seismic behaviors of group-pile foundation. Two kinds of models for a ground-pile foundation-superstructure system are used. Model 1 (M1) is a simplified model, in which, the interaction between piles and ground is represented by springs and the ground-pile foundation-superstructure system is simplified to a frame-spring model. Model 2 (M2) is called as sophisticated model, in which, the system is modeled with three-dimensional finite elements without simplification. The purpose of the research is to verify the applicability of the dynamic analysis with M1 model that is commonly used in ordinary seismic design and to establish a way of simplification from M2 model to M1 model without losing too much accuracy of the analysis by M1 model.
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