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针对核能设施地震动模拟中合成人工地震动功率谱包络的要求,比较由反应谱计算功率谱的几种常用方法,并分析各方法中相关参数对结果的影响。此外,采用拟合小阻尼反应谱生成人工时程并取各时程功率谱平均值的方法,可得到与反应谱相对应的功率谱。以AP1000和RG1.60的反应谱及其对应的目标功率谱为分析对象,考察由反应谱计算功率谱各种方法的计算精度,并着重对Kaul方法的适用性进行分析。最后给出核能设施地震动模拟时,获得足够精度功率谱的相关建议。
In order to meet the requirements of synthetic power spectrum envelopment of artificial ground motion in ground motion simulation of nuclear power facilities, several common methods for calculating power spectrum from response spectrum are compared and the influence of relevant parameters on each result is analyzed. In addition, the power spectrum corresponding to the response spectrum can be obtained by fitting the small damping response spectrum to generate the artificial time history and taking the average value of the power spectrum at each time period. Based on the response spectra of AP1000 and RG1.60 and their corresponding target power spectra, the computational accuracy of various methods for calculating the power spectrum from the response spectrum was investigated, and the applicability of the Kaul method was analyzed. Finally, some suggestions are given to get enough accurate power spectrum when simulating ground motion of nuclear facilities.