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

Author(s):: WANG Jue; CHENG Yu; AN Xiaowen; WEN Wen; YAO Jiangsen; (Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)

Keywords:: aseismic design; seismic fortification level; PGA; seismic yield acceleration; middle- and low-intensity zones; the rare earthquake

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%。

Abstract:: 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.