我国中、低烈度区罕遇地震设防水准的选取  

Seismic Fortification Level of Buildings Subjected to the Rare Earthquake in Middle-and Low-intensity Zones in China

作　　者：王珏[1] 程宇 安晓文[1] 文雯[1] 姚姜森 WANG Jue;CHENG Yu;AN Xiaowen;WEN Wen;YAO Jiangsen(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

机构地区：[1]云南省地震局,云南昆明650224

出　　处：《地震研究》2023年第3期415-421,共7页Journal of Seismological Research

基　　金：云南省地震局自立科研项目(2022ZLZX02);第一次全国自然灾害综合风险普查“一省一市”地震评估与区划项目.

摘　　要：采用概率地震危险性(PSHA)方法计算了我国中、低烈度区位于主要经济带内的28个大中城市50年超越概率3%和2%的地震动峰值加速度,为比较中、低烈度区罕遇地震不同设防水准的影响提供了定量数据;计算了中、低烈度区50年超越概率3%和2%地震作用下对应的建筑结构的屈服加速度,评价其抗震能力。结果表明:50年超越概率2%对应的屈服加速度明显大于50年超越概率3%的对应值。根据分析结果,建议抗震设计规范将中、低烈度区罕遇地震的设防水准统一至50年超越概率2%。The Probabilistic Seismic Hazard Analysis(PSHA)is used to compute the peak acceleration of earthquakes with a probability of more than 3%and 2%in 50 years for 28 large-and medium-sized cities of China in the middle-and low-intensity zones,which are situated in the main earthquake monitoring and preparedness areas.At the middle-and low-intensity locations,quantitative statistics from PSHA method are supplied to compare the impact of various seismic fortification levels.The seismic yield acceleration is then utilized as a measure to assess the seismic performance of the related building structures in the intermediate-and low-intensity zones hit by the earthquakes with exceeding probabilities of 3%and 2%in 50 years,respectively.According to the research results,the seismic design code should standardize the seismic fortification level of the rare earthquake at the middle-and low-intensity locations to a 2%exceeding probability in 50 years.

关 键 词：抗震设防 设防水准 PGA 屈服加速度 中、低烈度区 罕遇地震 

分 类 号：P315.91[天文地球—地震学]