In order to understand the soil-structure interaction,the excitation test of 1∶4 scaled steel frame-raft foundation model was carried out in the soil bin.By changing the stiffness of the superstructure,Gaussian white noise was inputted to measure vibration period,EL wave and Taft wave was inputted to known dynamic response and the shock absorption effected about the soil to the upper structure,the finite element software SAP2000 was used to simulate the steel frame-raft on rigid foundation,and then the dynamic response was analyzed.The results showed that the greater the additional period the upper part of the greater structural stiffness.The maximum of the additional period reaches 0.22 s.The soil has shock absorbing effect to the steel frame,and the effect is mainly with the change of structure stiffness.Because of the soil-structure interaction, the peak acceleration of the top storey is reduced while the steel framework is excited in the soil bin than on rigid foundation, the reduction factor is reached 0.661,and the peak displacement of the top storey is increased.
