基础隔震结构在侧向碰撞下的地震反应分析

本文针对基础隔震结构和临近构造物发生的碰撞问题进行了计算机三维模拟分析。定义了碰撞影响指标Q,建立了隔震结构的碰撞分析模型,通过弹塑性时程分析,分别从碰撞刚度、上部结构刚度、隔震支座、临近构造物与基础隔震结构的距离、地震动强度等5个方面研究了碰撞对基础隔震结构的影响作用。

Earthquake response analysis of base-isolated structure considering side impact

The paper reports the analytical study on a base-isolated structure subjected to intensive earthquake excitations.The analysis was carried out by computer-simulation of step-by-step time history responses using sophisticated three-dimensional structural model.Assuming the occurrence of impact between the isolated structure and retaining walls or adjacent structures during earthquakes,the study took the impaction stiffness,the superstructure stiffness,the mechanical properties of the bearing,the distance gap between the isolated structure and the impact objectives,and the input of seismic excitation as main fact parameters in the analysis to investigate the effect of the impaction on the isolated structure.It was found that all the facts in consideration significantly affect the superstructure's responses in the occurrence of impact by comparing the results of analysis with and without impaction.The study proposed an influence index to evaluate the effect of the impaction,which is simple and applicable in engineering practice.