基于性能的多层砌体结构地震易损性分析  

Performance-based seismic vulnerability analysis of multi-story masonry structures

作　　者：张永群 蒋利学[1,2] 王卓琳 ZHAGN Yongqun;JIANG Lixue;WANG Zhuolin(Shanghai Research Institute of Building Sciences Co.,Ltd,Shanghai 200032,China;Shanghai Key Laboratory of Engineering Structure Safety,Shanghai 200032,China)

机构地区：[1]上海市建筑科学研究院有限公司,上海200032 [2]上海市工程结构安全重点实验室,上海200032

出　　处：《建筑结构学报》2021年第5期64-71,共8页Journal of Building Structures

基　　金：“十三五”国家重点研发计划(2017YFC0806100);上海市优秀技术带头人计划(18XD1422800)。

摘　　要：为评估不同年代多层砖房的抗震性能,根据构造柱设置情况将多层砌体结构分为5个抗震措施类别,以静力非线性方法为基础,并利用层间位移角作为衡量不同破坏状态的量化指标,提出基于性能的多层砌体结构地震易损性分析方法。为考虑地震动的随机性和结构的随机性,采用蒙特卡洛法生成200万个结构-地震动随机样本并对其进行分析,建立多层砌体结构的地震易损性曲线,研究结构层数、抗震措施、材料强度、抗震墙面积率等因素对多层砌体结构地震易损性的影响。结果表明,结构层数对多层砌体结构地震易损性的影响最大,材料强度、抗震措施和抗震墙面积率对多层砌体结构地震易损性也有较大影响。基于易损性分析结果所建立的某多层砌体结构的地震易损性矩阵,可为基于性能的抗震评估提供参考。Based on five seismic measures levels proposed in this paper, the seismic performance was accessed for multi-story masonry structures constructed in different ages. The inter-story drift ratio, which reflects the damage states of the structure, was adopted as performance index to determine the structural performance level. Based on the static nonlinear method, a novel performance-based vulnerability analysis method was proposed to evaluate the seismic performance of multi-story masonry structures. Considering the uncertainty of the property of structures and earthquake ground motions, 2 000 000 stochastic masonry structure-earthquake ground motion samples were generated by using the Monte Carlo simulation method, the seismic vulnerability curves of multi-story masonry structures were derived considering the main variables such as the number of stories, the seismic measure, strength of mortar and the area ratio of seismic wall. It is indicated that the number of stories has the greatest impact on the seismic vulnerability of multi-story masonry structures, and the material strength, seismic measures, and the area ratio of seismic wall also have a great impact on the seismic vulnerability. Finally, the damage matrix of multi-story masonry structures was calculated based on the vulnerability analysis results and can be used as a reference for seismic performance assessment and risk assessment.

关 键 词：多层砌体结构 抗震措施 易损性 不确定性 层间位移 

分 类 号：TU362[建筑科学—结构工程] TU311.3