Numerical modeling of shaking table testing of soil-structure interaction system

Numerical modeling of a model of soil-structure interaction (SSI) system is performed by SASSI2000 pro- gram. The shaking table testing and simulation methods are introduced in this paper. The superstructure is regarded as 3-D finite elements connected at nodal points. The 3-D beam elements with three translational and three rotation- al DOFS per node simulate the beams and columns of superstructure. Four-node shell elements simulate the floors of superstructure and artificial mass is distributed over every shell elements. The surface footing of structure is simu- lated by 3-D solid elements with three translational DOFS per node. The site consists of semi-infinite viscoelatic horizontal layers on a rigid base. The dynamic nonlinear effects of soils is considered by using equivalent linear method. The iterated soil properties obtained from SHAKE program are used for SASS12000 analysis. The seismic responses of superstructure, under the condition of two sorts of grounds, three seismic events, three maximum ac- celeration levels and two input directions, are calculated by SASSI2000 program. Comparison between test results and calculated results indicated that the analysis model is good to simulating the performance of SSI system under seismic excitation. So, the test results are coincident with calculated results approximately.