The Application Of LS-DYNA In Soil-Structure Interaction

The problem of structure-foundation dynamic interaction is an essential research subject in the field of earthquake-engineering. ANSYS/LS-DYNA , one of the large-scale finite element analysis software, not only can better simulate the structure-foundation dynamic interaction, but also has the powerful functions of preprocessor and post processor. At present, the method of using ANSYS/LS-DYNA to analyze structure-foundation dynamic interaction has not been found in China, In this paper, LS-DYNA is illustrated to analyze structure-foundation interaction and also improve on calculating precision.The main contents of this paper could be summarized as follows:1. First, the functions and algorithm of ANSYS/LS-DYNA are introduced, on the basis of these, the program is exploited to analyze soil-structure interaction taking advantage of its functions of preprocessor and post processor, to analyze effectively and conveniently the problems on two dimensions SV-waves wave source in homogeneous elastic half space and on three dimensions in full space.2. Through the method of transforming incident seismic waves to equivalent load acting on artificial boundary. ANYS/LS-DYNA can be operated more conveniently. This paper popularizes the method on two dimensions and three dimensions problems, and testifies the feasibility of the method through analyzing SV-waves on two dimensions scattering problems and on three dimensions scattering problems in full space. Moreover . the paper takes Anti-seismic Center Synthetical Building in Yunnan Province for an example, and analyzes the scattering problems of structure-foundation system on three dimensions by inputting real seismic waves.3. .ANSYS/LS-DYNA program simulates the effects of infinite field by adopting viscous boundary. Because viscous boundary is a kind of low precision artificial boundary, through adding springs to artificial boundary, the paper improved viscous boundary to viscous-spring boundary with high precision. TheAbstractfeasibility of this method is testified through the example of wave source problems on the three dimensions in full space.At last the paper summarized the whole contents, and put forward the further contents that would to be researched.