Numerical analysis of shaking table tests on dynamic soil-structure interaction system under seismic excitations

This study investigates the dynamic soil-structure interaction (DSSI) of a soil-box foundation-12-story reinforced concrete (RC) frame system based on shaking table test data. A three-dimensional finite element model is developed in ABAQUS using the Drucker-Prager model for soil behavior, a master-slave contact algorithm for the soil-structure interface, and the plastic damage model for the RC structure. The numerical results agree well with the experimental data, validating the proposed modeling approach. Parametric analyses are conducted by varying foundation burial depth, superstructure stiffness, additional structural mass, and seismic input characteristics. The results show that decreasing the burial depth reduces the acceleration peak ratio between the foundation top and the free-field soil surface (A1/S10) by up to 4.37%. Increasing burial depth significantly decreases roof acceleration, inter-story shear force, and overturning moment by up to 52.12%, 28.23%, and 49.10%, respectively. These results provide insight into the seismic behavior of DSSI systems and a reliable numerical framework for evaluating soil-structure interaction effects.