Test Research And Simulation Analysis On Soil-Box Foundation-RC Frame Structure For Dynamic Interaction

As a part of the project aided by nature science national fund,《analysis of soil-foundation-structure dynamic interaction》(NO.50278033), some issues about test research and simulation analysis on soil-box foundation-RC frame structure are discussed in this thesis. These issues include the development in contact modal of dynamic analysis with soil-box foundation interaction, the effect on dynamic interaction with transform in parameter both of superstructure and soil, the research on seismic isolation by changing soil stiffness and introducing research result to the seismic structure design. The article is divided into five chapters, as follows:1. With the review of development which about theory research on soil-structure dynamic interaction, various analysis methods and applications, exceptionally for the research history of soil-foundation contact interface are introduced. The work in this paper is based on former researches.2. A test of large-scale outdoor model of soil-box foundation-RC frame structure is introduced, including geological conditions, the model itself and dynamic tests with those locations of the test position.3. Based on the large-scale outdoor model, the three dimension finite element model is established by using MSC.Marc program, which include gridding partition, artificial boundary condition, nonlinear simulation in dynamic interaction and calculation method. Then the model tests are simulated and the finite element model of test model is credible through comparing the results of tests and calculation.4. Some interface contact models of soil-structure and resolution principles of contact element in universal FEM program are introduced. Considering the energy dissipation between soil and the box foundation, a modified three dimension Goodman contact element is presented, and its element stiffness matrix is derivated. Also, some seismic response analysis which in different max acceleration features are presented by using spring in Marc program for simulating the modified contact element.5. The influence of soil-structure dynamic interaction is studied, which in different mass distribution, elastic modulus of concrete, stiffness distribution and soil dynamic characteristics. As a result of seismic response analysis, an idea is presented for structure seismic reduction by replacement of soft soil.