The Experimental Study And Computer Analysis Of Large Scale Soil-Pile-Frame Structural Model For Dynamic Interaction

Over the last several decades, study on Soil-Structure Interaction (SSI) is a research hotspot among researchers and engineers in the fields of earthquake engineering. The methods of their investigations consist of analysis research and experimental study, while the experimental research is relatively less, so the comparison analysis between computer simulation and test results is much less. Through comparison analysis, it is very significant that the rationality of computational model and the feasibility of model test can be verified.Some main achievements of this thesis are described as follows:(1) With the summarization of plenty of interrelated references, the studying actuality and developing level which about soil-structure interaction are presented, and the analytical ways of dynamic soil-pile-superstructure interaction are summarized;(2) Dynamic characteristics of site are analyzed comparatively through soil tests. By the use of a soil cyclic simple testing system,which is inputted into our country very newly, cyclic simple shear tests of each layer soil are performed, and the dynamic characteristics of them are obtained. Through these testes, abundant of experimental data are obtained, which can be used to verify the results of theoretical and analytical research and provides the basis for further research;(3) Based on large scale model tests on SSI system and using general-purpose finite element program MARC, some issues about modeling of soil-structure interaction system are discussed in this thesis. These issues mainly include selection of dynamic constitution model of soil, simulation of the changing-status non-linearity on soil-pile interface,meshing treatment of reinforcements in structure and so on;(4) Three-dimensional finite element analysis on large scale model of soil-pile-structure interaction system is carried out in this thesis. In the computational analysis, commonly used equivalent linearity model is chosen to consider the non-linearity of soil and the changing-status non-linearity on soil-pile interface is considered by surface-to-surface contact element. Comparison analysis between computational results and test results shows that the basic frequency and the tow-releasing test curves in time-domain are coincident approximately, and it's verified that the simulation methods in this paper are rational and the model is feasible. The computational analysis shows that large error will occur when the material non-linearity of soil is not considered in calculation of soft soil, and the...