我国现行规范谱的超越概率标准  

Levels of Probability of Exceedance for Current Code Spectra in China

作　　者：沈建文[1] 刘峥[1] 石树中 

机构地区：[1]上海市地震局,上海市兰溪路87号200062 [2]浙江省地震局,杭州310013

出　　处：《中国地震》2007年第3期245-250,共6页Earthquake Research in China

基　　金：浙江省重点科研社会发展项目(2005C23075)资助

摘　　要：工程场地的地震安全性评价给出的加速度反应谱在长周期部分一般均低于相应的规范谱。本文用Ⅰ类和Ⅲ类场地的地震动参数衰减规律,讨论加速度反应谱与不同周期规范谱值对应的重现期。结果表明,对加速度而言,基本情况是规范反应谱周期越长越保守。当峰值加速度对应的重现期为475年时,对于本文的工程算例,Ⅰ类和Ⅲ类场地的加速度反应谱分别于3.7s和5.2s以后超过重现期5000年。本文认为,对目前使用的衰减规律的可靠性,对一致概率谱与规范谱的关系,对按保守谱设计的工程在长周期地震波作用下的表现以及对速度、位移等在抗震设计中的作用等问题应作深入研究。Long-period acceleration spectra determined by seismic safety evaluation for project site are generally lower than that given by relative code spectra. The authors discuss the recurrence periods corresponding to the code spectra of different periods, by using ground motion attenuation laws for sites of types Ⅰand Ⅲ. They show the results that the longer periods of code spectra, commonly the more conservative of the aseismatic level. As for the project example, when the periods are larger than 3.7 or 5.2 seconds for sites of typesⅠor Ⅲ, the recurrence periods corresponding to the code spectra are larger than 5000 years. The authors suggest the problems needed to be further discussed, including reliability of the present attenuation laws, the performance of the project structures suffering long-period seismic waves that have been designed according to the conservative codes, and the effects of ground motion parameters such as velocity and displacement in aseismatic design.

关 键 词：抗震设计 规范谱 超越概率标准 

分 类 号：P315[天文地球—地震学]