摘要
选取合适的目标谱进行地震动记录的选择与调整是结构易损性分析的基础。首先,基于条件均值谱不同的参数设定,选取3组地震动记录;其次,运用谱匹配方法分别对设计谱和条件均值谱进行匹配。输入匹配前后共9组地震动记录对5层钢筋混凝土框架结构进行多重地震动强度水平的增量动力分析,提取工程需求参数如最大层间位移角和最大残余层间位移角,进而分析谱匹配效果的偏差指标以及不同损伤状态下的易损性分析和结构抗倒塌安全储备系数(CMR)。分析结果表明:谱匹配方法可以有效减小结构易损性的离散性;地震动记录的选择与谱匹配的目标谱相同时,各损伤状态下50%超越概率对应的S_(a)(T_(1),5%)值和CMR都未发生明显偏差;而当地震动记录的选择与谱匹配的目标谱不同时,各损伤状态下50%超越概率对应的S_(a)(T 1,5%)值和CMR作为两个指标可能会得到不同的偏差结果。
Choosing the appropriate target response spectrum for the selection and adjustment of ground motion records are the basis for seismic fragility analysis.First,3 groups of ground motion records were selected based on different parameters of the conditional mean spectrum,and used spectrum matching method respectively to the design spectrum and conditional mean spectrum matching.Then,analyses of incremental dynamic analysis(IDA)were conducted on a 5-storey reinforced concrete frame under the aforementioned 9 groups of ground motion records.Engineering demand parameters(EDP s)such as maximum inter-story drift ratios(θmax)and maximum residual inter-story drift ratios(RIDR max)were obtained.The bias indices to represent the spectral matching effect,seismic fragility analyses corresponding to different damage states and collapse margin ration(CMR)were conducted based on IDA results.Analytical results show that by using spectral matching,the dispersion of seismic fragility of structure is significantly reduced.When selection and spectrum-matched of ground motion records were the same target spectrum,S_(a)(T_(1),5%)values corresponding to different damage states and CMR were no obvious biases.When selection and spectrum-matched of ground motion records were the different target spectrum,S_(a()T_(1),5%)values corresponding to different damage states and CMR may get different bias of the results.
作者
魏世龙
韩建平
张鑫
黄鹏菽
王宗师
WEI Shilong;HAN Jianping;ZHANG Xin;HUANG Pengshu;WANG Zongshi(School of Civil Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou 730060,China;Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Shandong Provincial Key Lab of Appraisal and Retrofitting in Building Structures,Shandong Jianzhu University,Jinan 250101,China)
出处
《世界地震工程》
北大核心
2024年第2期26-34,共9页
World Earthquake Engineering
基金
国家自然科学基金项目(51578273,51268036)
甘肃省创新基金项目(2022A-208)
兰州石化职业技术大学科研创新团队项目。
关键词
易损性分析
条件均值谱
设计谱
增量动力分析
倒塌储备系数
seismic fragility analysis
conditional mean spectrum
design spectrum
incremental dynamic analysis
collapse margin ration
