非液化土-桩-结构动力体系运动和惯性相互作用分析OACHSSCD

The problem of dynamic soil-pile interaction in a non-liquefiable site was studied by combi-ning numerical simulation and shaking table tests.Based on the shake table tests of soil-pile-structure system at non-liquefiable sites,a cross-correlation analysis of soil displacement-pile moment and upper structure acceleration-pile moment was performed to analyze the influence of kinematic interac-tion and inertial interaction on the seismic response of the pile foundation.By combining the shaking table tests,a finite difference numerical analysis model of the non-liquefiable soil-pile group-upper structure dynamic system was established,and the correctness of this numerical model was verified.By comparing with numerical simulation results,the working mechanisms of kinematic interaction and inertial interaction in the seismic response process of the system were further explored.The results in-dicate that the effect of dynamic interaction on pile seismic response is much greater than that of iner-tial interaction,but inertial interaction still has a relatively significant impact on the response of the pile near the pile head.Select the upper structure mass,damping ratio,and natural vibration period as variables for parameter analysis,focusing on studying the effect of inertial interaction on the pile-structure failure mechanism.Studies shown that the mass,damping ratio and natural vibration period of upper structure are important parameters of inertia interaction in non-liquefiable site.The parameters have little effect on the bending moment of pile foundations,and their influence is mainly observed near the pile body position close to the pile cap.