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The Effect to Structure due to SSI

In order to understand the soil-structure interaction, we were doing the excitation test about 1:4 scaled steel frame-raft foundation model in the soil bin. The test was through changing the stiffness of the superstructure respectively. We inputting Gaussian white noise measured vibration period, dynamic response with EL and Taft wave show the shock absorption effect of the soil. Finite element software sap2000 simulated rigid foundation on the dynamic response analysis on the steel frames. We found that there are some differences about the natural period, the upper structural stiffness greater the additional period is longer. Soil has a shock absorbing effect with the steel frame, the effect mainly come from the change of structure stiffness. Because of the soil-structure interaction, peak acceleration of the top storey is reducer when steel framework excitation on the soil bin than on rigid foundation, and peak displacement of the top storey is increased.