Probability-consistent spectrum and code spectrum  

作　　者：沈建文[1] 石树中[2] 

机构地区：[1]Seismological Bureau of Shanghai [2]Tongji University

出　　处：《地震学报》2004年第1期94-101,共8页Acta Seismologica Sinica

基　　金：Shanghai Science & Technology Development Foundation (022512065) and Shanghai Construction Technology Development Foundation (A0206101).

摘　　要：In the seismic safety evaluation (SSE) for key projects, the probability-consistent spectrum (PCS), usually obtained from probabilistic seismic hazard analysis (PSHA), is not consistent with the design response spectrum given by Code for Seismic Design of Buildings (GB50011-2001). Sometimes, there may be a remarkable difference be-tween them. If the PCS is lower than the corresponding code design response spectrum (CDS), the seismic fortifi-cation criterion for the key projects would be lower than that for the general industry and civil buildings. In the paper, the relation between PCS and CDS is discussed by using the ideal simple potential seismic source. The re-sults show that in the most areas influenced mainly by the potential sources of the epicentral earthquakes and the regional earthquakes, PCS is generally lower than CDS in the long periods. We point out that the long-period re-sponse spectra of the code should be further studied and combined with the probability method of seismic zoning as much as possible. Because of the uncertainties in SSE, it should be prudent to use the long-period response spectra given by SSE for key projects when they are lower than CDS.In the seismic safety evaluation (SSE) for key projects, the probability-consis tent spectrum (PCS), usually obtained from probabilistic seismic hazard analysis (PSHA), is not consistent with the design response spectrum given by Code for S eismic Design of Buildings (GB50011-2001). Sometimes, there may be a remarkable difference between them. If the PCS is lower than the corresponding code design response spectrum (CDS), the seismic fortification criterion for the key projec ts would be lower than that for the general industry and civil buildings. In the paper, the relation between PCS and CDS is discussed by using the ideal simple potential seismic source. The results show that in the most areas influenced mai nly by the potential sources of the epicentral earthquakes and the regional eart hquakes, PCS is generally lower than CDS in the long periods. We point out that the long-period response spectra of the code should be further studied and comb ined with the probability method of seismic zoning as much as possible. Because of the uncertainties in SSE, it should be prudent to use the long-period respon se spectra given by SSE for key projects when they are lower than CDS.

关 键 词：一致概率谱规范谱 抗震设计标准 潜在震源 长周期 

分 类 号：P315.9[天文地球—地震学]