RC框架结构地震倒塌风险近似评价方法的精度对比  

Comparison Study on the Accuracy of Different Simplified Evaluation Methods for Seismic Collapse Risks of RC Frames

作　　者：刘艳 张磊[2] 顾栋炼 陆新征[2] LIU Yan;ZHANG Lei;GU Donglian;LU Xinzheng(College of Civil Engineering,Anhui Jianzhu University,Hefei 230601;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]清华大学土木工程系土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《防灾减灾工程学报》2018年第4期768-772,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51378299);安徽省高校自然科学研究项目(KJ2017JD01)资助

摘　　要：增量动力分析方法（IDA）是目前评价RC框架结构抗地震倒塌能力最精确的方法，但是计算量大、耗时长，在工程实际中难于应用。现阶段已经提出了多种简化评价方法，可显著提高工作效率，便于工程人员应用，但是对其精度缺乏合理评价。本文介绍了三种常用的简化评估方法，基于静力推覆分析和塑性需求曲线方法；基于静力推覆分析并利用抗倒塌储备系数（CMR）与位移安全储备系数关系方法；基于抗倒塌能力谱法，用这三种方法计算了6个RC框架结构在罕遇地震下的CMR和倒塌率，并与其IDA计算结果进行对比，分析了三种简化评估方法的精度。结果表明三种简化计算方法中基于静力推覆分析和塑性需求曲线方法精度最高，基于静力推覆分析并利用抗倒塌储备系数（CMR）与位移安全储备系数关系方法和基于抗倒塌能力谱法计算更简单快捷。The incremental dynamic analysis （IDA） by now is the most accurate method among all prediction methods which are used to assess the seismic collapse risk of RC frames. However, the IDA is too time-consuming to be used in real engineering. Simplifying the seismic collapse risk assess process is studied recently so as to improve efficiency for application. But there is lack of evidences to ensure the accuracies of different simplified methods. This work introduced three published simplified methods. The method based on the pushover analysis and the capacity curve; The method based on the pushover analysis and using the correlated relations between the collapse margin ratio （CMR） and the displacement margin ratio; The method based on the col- lapse resistant capacity spectrum. The collapse margin ratio and collapse risks subjected to severe earthquakes of 6 reinforced concrete frames are evaluated using the simplified methods and com- pared with the results of IDA. The results indicate that the most accurate method of the three is the method based on the pushover analysis and the capacity curve, and the more simple and con- venient methods are the method based on the pushover analysis and using the correlated relations between the collapse margin ratio （CMR） and the displacement margin ratio and the method based on the collapse resistant capacity spectrum.

关 键 词：增量动力分析 简化评价方法 倒塌安全储备系数 倒塌率 精度比较 

分 类 号：TU443[建筑科学—岩土工程]