摘要
为了研究等肢L形截面部分包覆钢-混凝土组合柱(简称L形PEC柱)的抗震性能,进行了不同轴压比和水平加载角度的4个组合柱拟静力加载试验。在此基础上进行有限元参数分析,考察轴压比和加载角度对L形PEC柱抗震性能的影响。研究结果表明:L形PEC柱均最终呈压弯破坏模式,其承载力退化系数均大于0.93,表现出良好的承载力稳定性;轴压比较小时L形PEC柱表现出良好的耗能能力和延性,轴压比较大时柱的耗能能力和延性较差;L形PEC柱的承载力最不利加载角为45°,加载角为0°时L形柱的承载力高但延性较差。综合试验和有限元分析结果,以位移延性系数为衡量标准,建议L形PEC柱在抗震等级为一级、二级、三级时的设计轴压比限值分别取0.55、0.65、0.75。
To study the seismic behavior of partially-encased steel-concrete composite columns with equal-limb Lshaped sections(abbreviated as L-shaped PEC columns),four L-shaped PEC columns with different axial compression ratios and horizontal loading angles were tested under cyclic loading.Finite element(FE)parametric analysis was performed to investigate the effects of the axial compression ratio and loading angle on the seismic behavior of L-shaped PEC columns.The results show that all L-shaped PEC column specimens exhibit a compression-bending failure mode,and the load-bearing capacity degradation coefficient of all specimens is greater than 0.93,indicating stable loadbearing capacity.The results also show that L-shaped columns with a small axial compression ratio exhibit good energy dissipation capacity and ductility,while those with a large compression ratio exhibit poor ductility and reduced energy dissipation capacity.It is found that L-shaped columns under a 45°loading angle have the lowest bearing capacity,and the columns under a 0°loading angle have the highest bearing capacity but are less favorable in terms of ductility.Based on the test and FE results,using the displacement ductility coefficient as a criterion,it is suggested that for seismic gradesⅠ,ⅡandⅢ,the design axial compression ratios for L-shaped columns are 0.55,0.65 and 0.75,respectively.
作者
章雪峰
赵必大
王伟
李瑞锋
毛麟飞
ZHANG Xuefeng;ZHAO Bida;WANG Wei;LI Ruifeng;MAO Linfei(Zhejiang Design Group Co.,Ltd,Zhejiang University of Technology,Hangzhou 310014,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Zhejiang Jinggong Green Building System Technology Co.,Ltd,Shaoxing 312030,China)
出处
《建筑结构学报》
CSCD
北大核心
2024年第S2期289-299,共11页
Journal of Building Structures
基金
浙江省自然科学基金项目(LY20E080020)
关键词
部分包覆钢-混凝土组合柱
等肢L形截面
拟静力试验
抗震性能
partially-encased steel-concrete composite column
equal-limb L-shaped section
quasi-static test
seismic behavior
