The Studies On Soil And Structure Dynamical Interaction For Contact Effect

Based on the large-scale model test on soil-pile-structure interaction, as a part of the project financed by nature science national fund, analysis of soil-foundation -structure dynamic interaction (NO.50278033), some issues about modeling of soil-structure interaction system are discussed in this thesis. These issues mainly include simulation of soil infinity, selection of dynamic constitution model of material, simulation of the changing status nonlinearity on soil structure interface, meshing, using of symmetry principle and so on. Three-dimensional finite element analysis on large-scale test on soil-pile -structure interaction system is carried out in this thesis. In computational analysis, perfectly-plastic Mohr-Coulomb material and kinematic hardening Von-Mises material are chosen to simulate the non-linearity of soil and reinforced-concrete separately, and the changing status non-linearity on soil structure interface is considered by using contact function of MARC. Comparison analysis between computational results and test results shows that the basic frequency and 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.In this paper, we have studied a lot of systematic numerical values with analyzing the models which built with above-mentioned method; and these models are about the contact surface effect of soil-structure dynamic interaction under different basic forms, different seismic waves input. We have discussed the two-dimensional contact surface effect of the part-embedding structure in earthquake function on both a part-embedding of structure model and a box-foundation structure model. Based these studies, we have carried on more detailed quantitative analysis to the contact surface effect of box-foundation in earthquake function. Regard large proportion test model in field of this subject as the background finally, we had more detailed analysis on soil-structure interaction contact surface effect in the influence reflected to the frame structure motive force by under draws-releases surge-shake. The conclusion is the dynamic force of soil-structure between nonlinear and linear is obvious difference under earthquake; the displacement on box-foundation obviously increases compared with the linear disposition condition. After considering nonlinear interaction, the bottom internal force of soil-box-foundation-frame structure is smaller than the linear result.