Dynamic behavior of group-pile foundation evaluated by simplified model andsophisticated model

摘要

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