断层场地地震反应特征研究

Study on characteristics of seismic responses of fault sites

如何合理评价断层场地对地震动影响进而为重大工程抗震设计提供依据是当前急需解决但尚未解决好的工程场地问题。针对根据工程经验抽象出的8种设想断层场地模型,应用显式有限元模拟计算了脉冲P波、SV波倾斜入射下的地震反应。根据数值模拟结果,总结和给出了断层倾向、破碎带宽度、破碎带形态对地震动影响的初步定量规律。

Evaluation of fault effect on earthquake ground motion is a regular puzzle in project construction. It also is one of the urgent under-resolving questions in engineering site,for which there is not exhaustible approach at present. For eight suppositive fault site models summarized from engineering experience, the linear elastic seismic responses subjected to inclined P and SV pulse wave are numerically simulated by use of explicit finiteelement method. The primary quantitative rules of fault dip, crushed belt width and shape effect on the earthquake ground motion are summarized from these simulation results.