| The problem of soil-structure dynamic interaction is a frontal question for discussion in earthquake engineering and civil engineering fields. At present, though we have got some results in theoretical analysis, experimental study and observation, there are still so many problems needed studying, because the question is more complicated and is harder to study compared to other mellow topics.So it has important theoretical significance and practical meaning to do the experiment on soil-structure dynamic interaction system,The results of the experiment can be used to validate the theoretical results,impel the theory to be applied in practical engineering.This thesis is supported by both Nature Science Fund of Hubei province and Institude of rock and soil mechnics of Chinese academy of sciences.It research on principles and disciplines of the SSI under seismic loading through the shaking table tests and finite element analysis.The main contributions in this thesis are as follows:1.According to the present situation of dynamic soil-structure interaction research all over the world, this thesis summarizes and reviews the theoretical analysis and experimental results, analyzes the problem in this field, and presents the topics of this thesis.2.Based on the modal analysis of superstructure model and soft soil-pile foundation-superstructure interactive system model of 1/50 scale.This thesis gains the dynamic behaviors(mode,period,damping)of the superstructure with fixed base model and soft soil-pile foundation-superstructure interactive system model.The shaking table tests were performed on the two models,which open out the seismic response (displacement, velocity, acceleration and stress) discipline of the two systems. The results show that the soil of foundation can magnify the seismic wave obviously, and its amplification modulus relate to the spectral characteristics and the peak value of the acceleration of the seismic wave that input in the shaking table.3.Through the data of shaking table tests, this thesis discusses how to make use of ANSYS to analyze the dynamic behaviors and seismic response of superstructure model and soft soil-pile foundation-superstructure interactive system model, including the imitation of soil container,choice of the dynamic constitutive model of soil,meshing generation,dealing with reinforcing steel bar of structure,boundary of soil etc.The results show that: ANSYS can imitate interactive response system;perfect imitation results can be gotten applying simple boundary if the side boundary range and the depth of soil are enough.4.Based on the secondary development, the paper adopts ANSYS to establish 3-D finite element models on superstructure model and soft soil-pile foundation -superstructure interactive system model, to analyze the dynamic behaviors, and to calculate the seismic response of the two systems under El-Centro wave, Tianjing wave and the artificial of Wuhan wave. The results show that: the systems represent obviously different seismic response under different seismic waves; and the seismic response ofthe systems under bi-directional and tri-directional seismic wave are greater than that of single directional seismic wave.5.Compared the results of finite element analysis and the data of shaking table tests,the thesis validates the rationality of the calculate model,and studies the results of finite element analysis deeply,gets available conclusions which provide theoretical gist and experiment data to perfect interrelated code and the explanation about Code for seismic design of 6?/u/mg(GB50011-2001),supplying the designers with valuable reference data.Finally,this thesis brings forward some problems needed to study further on the base of summarizing the whole thesis.
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