强余震荷载的确定

Determination of Strong After-shock Load

介绍了强余震震级与主震震级的统计关系和确定强余震荷载频谱的方法,按照一定的筛选原则,挑选出大量强余震记录,通过回归分析,得到了强余震振幅、持时与主震震级之间的统计关系;给出了利用上述统计关系确定设计基准期内可能发生的强余震荷载的方法;提出了从结构在主、余震作用下的反应分析和抗震设计的需要出发,将主震的人造地震波与余震的人造地震波前后相连作为一条持时延长的地震波的意见,为分析结构在主余震作用下的累积损伤、使结构抗震设计更趋合理作了进一步尝试。

Because strong after-shocks have important influence on seismic performance of structure, this paper firstly introduces statistical relationship between earthquake magnitude of after-shock and main shock, Secondly, based on response analysis and seismic design when the structure suffers the action of main shocks and after-shocks, one seismic wave is made by connecting main shocks of artificial seismic waves and after- shocks of the front and back artificial seismic waves, This paper makes a further attempt to analyze cumulative damage under the action of main shock and after-shocks and to make seismic design of structures rationally.