建筑钢结构进展2025，Vol.27Issue(4)：87-99,13.DOI:10.13969/j.jzgjgjz.20231024001
部分包覆钢-混凝土组合中心支撑框架抗震性能研究
Seismic Performance of Partially Encased Composite Concentrically Braced Frames
摘要
Abstract
To promote construction industrialization and improve the seismic performance of moment resisting frames with concentrically brace,a new type of partially encased composite(PEC)brace is proposed.Low-cyclic reversed loading tests were carried out on three PEC braces and one steel brace.Failure modes,hysteretic curves,initial stiffness,bearing capacity,ductility and energy dissipation capacity were studied.The results show that the PEC frame and the PEC brace cooperate well as the two structural seismic lines.And compared to the steel brace,three PEC braces are improved in initial stiffness by 24%-41%,bearing capacity by 29%-36%and energy dissipation capacity by 7%-17%,indicating that PEC braces have excellent seismic performance.Based on the results of the experiment,the nonlinear finite element analysis was carried out by ABAQUS software.The geometric nonlinear behaviors such as local buckling and global buckling are observed in finite element models,and the results such as peak load and yield load are in good agreement with the experimental results(the error is within 10%).The finite element analysis shows PEC braces yield earlier than the PEC frame,which is the expected failure sequence.Additionally,the stress concentration and local buckling of joint of brace can be effectively inhibited by setting concrete or stiffeners on the web.关键词
部分包覆钢-混凝土组合中心支撑/框架-中心支撑体系/抗震性能/低周往复加载试验/有限元分析Key words
partially encased composite concentrically brace/concentrically braced frame/seismic behaviour/low-cyclic reversed loading test/finite element analysis分类
建筑与水利引用本文复制引用
贾王龙,李永刚,董夏琦,阎田,方成,庄向平,杨宇焜..部分包覆钢-混凝土组合中心支撑框架抗震性能研究[J].建筑钢结构进展,2025,27(4):87-99,13.基金项目
国家自然科学基金(52378177、52078359),上海市"曙光计划"(22SG18) （52378177、52078359）
