| The research of pile-soil-structure-dynamic interaction is very important to improve the reliability ang safety of pile foundation under dynamic loads. Many researchers have done lots of works in this field and obtained a large number of valued results. However the dynamic interaction of pile-soil-superstructure system is so complicated that there are still many key issues to be required for further researches.Dynamic characteristics of site are analyzed comparatively through soil tests. Field tests and laboratory tests are performed, and the difference of results isresearched comparatively. The dynamic triaxial test of soil, the analysis of dynamic parameters, and determined the dynamic characteristics of the soil. Grasping the dynamic characteristics of the general field in Changsha city has certain reference value.In the dissertation,an analysis model of 3×3 group pile and 2×2 foundations with different pile spacing and pile diameter is built up. The pile-soil-structure dynamic interaction under horizontal seismic excitations is analyzed by using three-dimensional elastic- plastic finite element method in the develop platform ANSYS. Hardin model is chosen to simulate the non-linear characteristics of soil.
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