摘要
利用ATC-63项目关于一般建设工程抗倒塌能力的不确定性推荐成果,考虑我国地震环境的差异,采用风险积分的方法在不同形状超越概率曲线的基础上耦合了结构倒塌能力的不确定性,获得了中国大陆地区对应于罕遇地震水平(50年超越概率2%)峰值加速度的倒塌概率、50年倒塌概率1%所对应的峰值加速度以及50年倒塌概率1%所对应的峰值加速度与罕遇地震水平峰值加速度的比值(文中称'风险系数')。研究认为中国大陆地区罕遇地震水平的峰值加速度大致相当于50年倒塌概率1%所对应的峰值加速度,中国大陆地区风险系数绝大部分集中在0.8~1.2之间,为了满足中国大陆地区一般建设工程具有一致的抗倒塌能力,建议利用风险系数图对罕遇地震水平的峰值加速度进行调整。我国东南沿海部分人口稠密、经济发达地区,其罕遇地震水平峰值加速度对应的50年倒塌概率为2%~5%,明显高于其他地区,应该引起足够重视。
Considering the difference of seismic environment in China,based on collapse resistant capacity uncertainty recommended by ATC-63 project,collapse probability of peak ground acceleration corresponding to rare ground motion( 50-year 2% probability of exceedance),peak ground acceleration for 50-year 1% probability of collapse and ratio( risk factor) of peak ground acceleration for 50-year 1% probability of collapse to peak ground acceleration for rare ground motion were acquired using risk integration,in which the probability distribution for the collapse resistant capacity was coupled with corresponding ground motion hazard curve for the location of the structure. Research and analysis show that peak ground acceleration for rare ground motion is roughly equivalent to peak ground acceleration for50-year 1% probability of collapse in China,and the risk factor of most parts of China is between 0. 8 and 1. 2. In order that nationwide general construction projects have consistent ability of collapse resistance, risk factor is recommended to adjust peak ground acceleration for rare ground motion. Collapse probability of peak ground acceleration corresponding to rare ground motion in some coastal areas of southeast China,which is the densely populated and economically developed areas,is about 2% ~ 5% in 50-year,and is significantly higher than that in other regions,which should be paid enough attention.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第1期23-29,共7页
Journal of Building Structures
基金
"十二五"国家科技支撑计划(2012BAK15B01)
地震行业科研专项(201308018)
