Pile Group Effects in Seismic Soil-Pile-Structure Interaction

摘要

Using a three-dimensional finite element model of a soil-pile foundation system, the effects of pile groups on seismic responses of the soil-pile system are studied. Drucker-Prager constitutive model is employed to represent the nonlinear behavior of the soil material. Radiation damping is simulated by an infinite element boundary condition and is explained quantitatively using energy transmission and dissipation. Nonlinear analyses in the time domain are performed for harmonic and specific seismic excitations. A comparison of pile responses due to different finite element model dimensions is implemented. The effects of pile spacing ratios and pile-soil stiffness ratios on seismic responses of the soil-pile system are studied. This study suggests radiation damping is predominant after quantifying the energy transmission and dissipation of the soil-pile system during earthquake excitations.