一次冲击地震动的特性研究

RESEARCH ON DYNAMIC CHARACTER OF ONE-OFF IMPACTION GROUND MOTION

一次冲击型地震是天然地震中的一种典型地震动 ,与其他常见地震相比 ,具有持续时间短、衰减速度快等特点。由于其独特的动力特点 ,利用以概率论为基础的传统方法研究此类地震动力特征是不合适的 ,而应该使用以确定性理论为主的数学分析方法。总结出一次冲击地震动的特点、产生条件及形成机制。在此基础上 ,首次对其震动历时过程进行拟合计算 ,并取得了较好的应用效果 ,实践证明这种方法是行之有效的。

Characterized by short duration and quick attenuation, One-off impaction ground motion is more typical than others. On account of its particular dynamic characters, this kind of ground motion should be analysed and calculated by determinate mathematic methods instead of conventional stochastic ones. Its physical mechanism and vibrative characters are discussed in this paper. Based on this, its time historical vibrations including acceleration, velocity and displacement are simulated by determinate mathematic methods. The practice proves that the method is feasible and valid.