一致概率谱衰减指数的取值方法探讨
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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,特别是在长周期部分,一致概率谱一般均低于相应的规范谱。为解决地震安全性评价得到的一致概率谱在抗震设计中的应用,本文通过比较、分析一致概率谱和规范谱,针对一致概率谱标定得到的衰减指数γ较规范谱明显偏大的特点,提出了一致概率谱衰减指数的取值方法。
Acceleration spectra determined by seismic safety evaluation for engineering site are often inconsistent with code spectra. Especially in long-period range, acceleration spectra determined by seismic safety evaluation are generally lower. In order to make usage of spectra determined by seismic safety evaluation in anti-earthquake design, we propose a method to determine consistent spectrum decaying constant γ.
Acceleration spectra determined by seismic safety evaluation for engineering site are often inconsistent with code spectra. Especially in long-period range, acceleration spectra determined by seismic safety evaluation are generally lower. In order to make usage of spectra determined by seismic safety evaluation in anti-earthquake design, we propose a method to determine consistent spectrum decaying constant γ.
引文
胡聿贤,张敏政,1984.缺乏强震观测资料地区地震动参数的估算方法.地震工程与工程振动,4(1):1—11.
沈建文,石树中,2004.一致概率谱与规范谱.地震学报,26(1):94—101.
王绍博,李斌,徐海云,2006.关于工程场地地震安全性评价中设计地震动反应谱的讨论.震灾防御技术,1(4):302—307.
俞言祥,胡聿贤,2000.关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论.地震工程与工程振动,20(1):27—34.
周锡元,1990.场地·地基·设计地震.北京:地震出版社.
沈建文,石树中,2004.一致概率谱与规范谱.地震学报,26(1):94—101.
王绍博,李斌,徐海云,2006.关于工程场地地震安全性评价中设计地震动反应谱的讨论.震灾防御技术,1(4):302—307.
俞言祥,胡聿贤,2000.关于上海市《建筑抗震设计规程》中长周期设计反应谱的讨论.地震工程与工程振动,20(1):27—34.
周锡元,1990.场地·地基·设计地震.北京:地震出版社.
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