Effects of soil-structure cluster interactions on ground motions

The effects of soil-structure cluster interaction (SSCI) on ground motion are presented through shaking table tests and parametric numerical simulation using the finite element method. The superstructure is simplified as a concrete column at a 1/20 scale, with a total mass of 60 kg installed on top of the structures. The Davidenkov foundation model is used to simulate soil nonlinearity. The results of the shaking table test are then compared with the results of the numerical simulation. It is found that the spectral amplification and fundamental resonance frequency are reduced because of the SSCI effects. Further, the structure amount, spacing, height, and distribution play a significant role in the SSCI effects on the ground motion. It is also inferred that having more structures, less spacing, and higher structures may result in a reduction in the acceleration response.