模型参数不确定性对结构抗地震倒塌能力影响的定量估计  

Quantitative Estimation of the Effect of Model Parameter Uncertainties on the Collapse Resistance of Structures

作　　者：施炜[1] 张磊[1] 陆新征[1] 叶列平[1] 

机构地区：[1]清华大学土木工程系,清华大学结构工程与振动教育部重点实验室,北京100084

出　　处：《工程抗震与加固改造》2015年第2期9-16,8,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51378299,51222804,51178249);国家科技支撑计划课题(2013BAJ08B02)

摘　　要：以设计基准期内地震倒塌的概率作为工程结构抗震设防的目标,已经成为国际抗震领域研究的重要方向,而预测结构地震倒塌概率时应充分考虑结构参数不确定性的影响。为此,本文以RC框架结构为基本研究对象,基于非线性动力时程分析,采用IDA方法和中心点法,估计模型参数不确定性对RC框架结构抗地震倒塌能力的影响。结合4个RC框架结构算例,分析了结构在地震作用下抗倒塌能力对10个主要模型参数的敏感性。分析表明,源于模型参数的不确定性bMDL对抗倒塌能力的影响可达到地震动不确定性bRTR的50%～65%,应予以合理考虑。其中,结构抗倒塌能力对混凝土极限强度fu、混凝土极限压应变eu的取值最为敏感。Taking the earthquake-induced collapse probability during the design life time as the target of seismic design has become an important research direction in the international earthquake engineering community,and the impact of model parameter uncertainty should be fully taken into account when predicting the earthquake-induced collapse probability of structures. Taking the RC frames as the research object and using IDA and the center point method,this work estimates the model parameter uncertainty on the collapse resistance of RC frames based on the nonlinear dynamic time history analysis. The sensibility of collapse resistance of 4 multiple-story RC frames to 10 main model parameters is analyzed as an example. The results indicate that the model parameter uncertainty bMDLcan reach 50% ～ 65% of the uncertainty of ground motion bRTRand the collapse resistance of the RC frames is mostly sensitive to the value of the ultimate strength and ultimate compressive strain of concrete.

关 键 词：中心点法 结构模型参数不确定性 逐步动力增量分析 RC框架 抗地震倒塌 

分 类 号：TU352.11[建筑科学—结构工程]