摘要
建筑结构的抗震能力、尤其是抗倒塌能力设计目标应根据其所在场地未来一定设计使用年限内可能遭遇的地震危险性来设定。首先介绍了基于动力增量分析(IDA)的结构倒塌易损性分析方法,随后结合地震危险性分析,分别给出了结构抗倒塌能力和结构所面临地震危险性的概率模型,进而根据结构在未来一定设计使用年限内的倒塌概率,对建筑结构的抗地震倒塌风险进行定量评价,并给出了相应的计算方法。以一座7度抗震设防的RC框架结构为例,计算了该RC框架结构在3个同为7度抗震设防而地震危险性不同地区的地震倒塌风险,指出仅以抗震设防烈度作为建筑结构抗震设计的依据所存在的不足,建议应基于一致倒塌风险进行结构抗震设计,并提出了相关结构抗震设计方法需开展的研究工作。
Seismic design should quantitatively evaluate and control the earthquake collapse risk that building structures are likely to encounter during the design service life,which needs taking both the structural collapse resistant capacity and the earthquake demand into consideration.Firstly,this paper introduced IDA-based collapse fragility analysis and seismic hazard analysis,which evaluated the structural collapse resisting capacity and the earthquake demand in terms of probability,respectively.Furthermore,the structural collapse probability was proposed for measuring the earthquake collapse risk and its calculation method was provided.Finally,the collapse probabilities of RC frame structure for three seven-fortification areas with different seismic hazards were calculated as an example.The result shows the inadequacy of evaluating earthquake collapse risk only based on seismic fortification.The uniform-risk-targeted seismic design was proposed for collapse safety.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第6期1-7,共7页
Journal of Building Structures
基金
国家科技支撑计划课题(2009BAJ28B01)
国家自然科学基金重点项目(90815025)
中国工程院重大咨询项目(2010-ZD-4)
关键词
建筑结构
地震需求
结构倒塌易损性
地震危险性
一致倒塌风险
building structure
earthquake demand
collapse fragility
seismic hazard
uniform-risk-targeted collapse safety
