Probabilistic Seismic Fragility Evaluation of CFST Frames with Buckling-Restrained Braces

被引：1
|
作者：
Wang J. [1 ,2 ]
Li B. [1 ,3 ]
Wang Y. [3 ]
Li G. [1 ,2 ]
机构：
[1] College of Civil Engineering, Hefei University of Technology, Hefei
[2] Key Laboratory of Anhui Civil Engineering Structures and Materials, Hefei University of Technology, Hefei
[3] Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education, Tsinghua University, Beijing
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 03期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
buckling-restrained brace(BRB); concrete-filled steel tube(CFST) frame; damage index; fragility curve; ground motion duration;
D O I：
10.11784/tdxbz202109026
中图分类号：
学科分类号：
摘要：
A nine-story structure was designed based on a plastic design method using energy balance to investigate the seismic behavior and the influence of ground motion duration on the probabilistic seismic fragility for the concrete-filled steel tube(CFST)frames with buckling-restrained braces(BRBs). Low cyclic testing and numerical analysis were performed on a one-bay one-story braced frame specimen. The elastic-plastic analytical model of the nine-story typical three-span substructure was established using the OpenSees program. The effect of ground motion duration on the seismic intensity performance of the structure was analyzed via fragility curves using various engineering demand parameters(EDPs)and intensity measures obtained from incremental dynamic analysis. The analysis results showed that the hysteretic curve of the test specimen is plump and stable. BRBs dissipated 90% of the hysteretic energy of the structure. Meanwhile，the overall damage index(ODI)could better reflect the influence of the ground motion duration on the cumulative damage effect of the structure. Long-duration ground motions reduced the median value of structural collapse by 24% compared to short-duration ground motions. With ODI as the EDP，the combined index INP-D，which considers spectrum acceleration and a significant duration，shows excellent practicability，efficiency，sufficiency，and scaling robustness. For the INP-D，the probabilities of ODI exceeding 0.2 and 0.4 under long-duration ground motion were 1.74 and 5.0 times that under a short-duration ground motion，respectively，for the structure subjected to rare earthquakes. Therefore，the influence of ground motion duration on the cumulative damage for CFST frames with BRBs should be considered during structural seismic design and analysis. © 2023 Tianjin University. All rights reserved.
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页码：311 / 322
页数：11
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