一致概率谱与规范谱
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摘要
在重大工程的地震安全性评价工作中 ,根据概率法地震危险性分析得到的一致概率反应谱 ,与建筑抗震设计规范给出的设计反应谱常常不一致 ,有时甚至会有较大的差异 .一致概率反应谱低于相应的规范反应谱时 ,可能会产生重大工程抗震设防标准低于一般工业与民用建筑抗震设防标准的问题 .本文利用理想简化的潜在震源 ,对一致概率谱与规范设计反应谱之间的关系进行了讨论 .分析结果表明 ,对于较为普遍的主要受直下型地震和近震潜源影响的地区 ,在长周期部分 ,一致概率谱总体小于规范谱 .规范谱长周期部分值得深入研究 ,且应尽可能与区划工作的概率法相结合 .由于地震安全性评价工作存在较大的不确定性 ,故重大工程的抗震设防标准 ,据地震安全性评价结果将长周期部分降至规范谱 (一般工民建 )之下宜慎重
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.
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.
引文
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霍俊荣.1989.近场地面运动衰减规律的研究[D]:[学位论文].哈尔滨:国家地震局工程力学研究所,206～207
项宗方,李英民,王亚勇,等.1998.基于统计分析的长周期反应谱特性[A].见:中国地震学会地震工程专业委员会,中国建筑学会地震工程学术委员会编.第五届全国地震工程学术会议论文集[C].117～123
中华人民共和国建设部.2001.建筑抗震设计规范(GB500112001)[M].北京:中国建筑工业出版社,26～40
国家质量技术监督局.2001.中国地震动参数区划图(GB183062001)[M].北京:中国标准出版社,1～2
国家质量技术监督局.1999.工程场地地震安全性评价技术规范(GB17741～1999)[M].北京:中国标准出版社,1～10
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