Shaking Table Test Study on Seismic Response of Soil-structure Cluster Interaction System

A series of shaking table tests of soil-structure (group) interaction systems are designed and implemented in the paper, the parameters such as the number of structures, and the type and amplitude of ground motion are considered to explore the influence of the SSCI effect on the structure and site soil response. And the methods to determine model soil parameters are discussed. The comparative analysis based on the test results shows that: (1) the existence of surface buildings does not always reduce the ground motion of the free field, but the ground motion decreases with the increase of the number of surface structures. (2) The SSCI effect has the greatest impact on the structural response at the center of the structure group, and it also will amplify the response components near the predominant frequency of the soil. (3) Different evaluation indicators have different emphases, However, they both can evaluate the interaction between structural groups well; (4) the higher the total energy of the input ground motion, the more obvious the SSCI effect.