中文摘要：

简要介绍了地震动随机模拟方法的原理,总结了影响地震动随机模拟结果的输入参数,重点分析了应力降、品质因子、高频衰减参数对PGA和反应谱Sa的影响。研究结果表明：应力降对地震动模拟结果影响最大;随着应力降的增加,PGA增大,各周期处的反应谱均有较大变化;矩震级增大时,PGA和反应谱的受应力降的影响也相应增大;品质因子Q0和指数n越大,PGA也越大,短周期处的反应谱受两者影响大,长周期处受其影响小;高频衰减参数k增大时,PGA和反应谱相应减小,k对PGA和短周期处的反应谱影响较大。

英文摘要：

The principle of the stochastic ground motion simulation method and input parameters which affect the re- sults of simulation are briefly reviewed and discussed in this paper. The effects of input parameters on PGA and re- sponse spectra are analyzed in detail, in particular for parameters as stress drop, quality factor and high frequency decay parameter. It is shown by results that the most sensitive parameter is stress drop. Via increasing the value of stress drop, PGA grows quickly and obvious change of response spectra in the whole interested period band can be observed. The value of PGA and response spectra increase with moment magnitude. Same tendency has been ob- served for the effect of quality factor Q0 and index n on PGA. The response spectra in short period is more sensitive to Q0 and n, compared with its in long period. In contrast, PGA and response spectra decrease with the increase of kappa. Instead of the response spectra in long period, the response spectra in short period is more sensitive to high frequency decay parameter k.