强震记录中速度大脉冲模拟及其对反应谱的影响

The Simulation of Big Velocity Pulse of Strong Motion Records and the Analysis of Their Impact on Response Spectra

在近断层地震中,具有速度大脉冲的强震动对建筑物的影响较大。为了描述速度大脉冲,Makris和Roussos提出了由简单连续函数构成的模型,该模型参数较少、形式简单,用来描述实际地震记录中的速度脉冲大多取得较好的效果,但还是有一些记录模拟的结果会出现"丢失"现象,存在一些缺陷。针对此问题,本文提出了2个改进的方法——组合法和镜像法,用来扩展Makris和Roussos模型的适用范围,使其具有更好的适应性。

In the near-fault earthquake, strong motion records with a big velocity pulse make a greater impact on the buildings. In order to describe the big velocity pulse, Makris and Roussos made a simple model consisting of a continuous function, with less parameters and simple form. Its results were good. Makris and others used to describe many real seismic records, the simulation results of big velocity pulses are good. But we found that there were some records, in which the ＂missing＂ phenomenon occured in the simulation results. The effect was not very satisfactory. For this problem, this paper presents two improved methods, i.e. combination method and mirror image method, to expand the application scope of the Makris and Roussos model, so that it has high adaptability.