四肢钢管混凝土格构柱试验研究及参数分析  

Experimental Study and Parameter Analysis of Four⁃tube Concrete⁃filled Steel Tube Lattice Columns

作　　者：黄志 熊陆增 蒋丽忠 周旺保[3] 谌湘文[1] 戚菁菁 HUANG Zhi;XIONG Luzeng;JIANG Lizhong;ZHOU Wangbao;CHEN Xiangwen;QI Jingjing(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Engineering Research Center for Intelligently Prefabricate Passive House,Xiangtan 411201,China;School of Civil Engineering,Central South University,Changsha 410075,China;Xiangtan Institute of Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南省智慧建造装配式被动房工程技术研究中心,湖南湘潭411201 [3]中南大学土木工程学院,湖南长沙410075 [4]湘潭理工学院,湖南湘潭411201

出　　处：《防灾减灾工程学报》2024年第3期616-622,631,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：湖南省教育厅科学研究优秀青年项目(20B214);湖南省教育厅科学研究项目(20A184)资助;国家自然科学基金(51808213);湖南省自然科学基金(2019JJ50185)。

摘　　要：为研究四肢钢管混凝土格构柱的受力机理及抗震性能,对4根四肢格构柱进行拟静力试验研究及有限元分析。通过试验得到四肢钢管混凝土格构在低周往复荷载作用下的滞回曲线和骨架曲线,分析了试件破坏过程。研究结果表明:格构柱的耗能能力及延性都较好;轴压比对试件的影响主要体现在破坏阶段,轴压比越大承载力下降段的斜率越大;长细比对试件受力性能有较大影响,随着长细比增大,试件的屈服位移和极限位移会增大,但水平承载力和破坏段的斜率会降低。建立了数值计算模型,并与试验结果进行对比,验证其正确性。并对不同高宽比、节间距与柱肢外径比等参数对试件弹性刚度和承载力的影响进行分析,结果表明:减小格构柱的高宽比和节间距与柱肢外径比对格构柱的受力性能有很大提升。建议实际工程中格构柱的高宽比不宜大于4.8;节间距与柱肢外径比低不宜大于7.0。To investigate the stress mechanism and seismic performance of the four-tube concrete-filled steel tube(CFST)lattice columns,quasi-static tests and finite element analysis were conducted on four specimens.The hysteresis and skeleton curves of the four-tube CFST lattice columns under low-cycle repeated loads were obtained through experiments,and the failure process of the specimens was analyzed.The results showed that the lattice columns exhibited good energy dissipation capacity and ductility.The axial compression ratio mainly affected the specimens during the failure stage,with a larger axial compression ratio leading to a greater slope in the descending section of the bearing ca-pacity.However,the slenderness ratio had a significant effect on the stress performance of the speci-mens.With the increase in slenderness ratio,the yield and ultimate displacement of the specimens in-creased,but the horizontal bearing capacity and the slope in the failure section decreased.A numerical calculation model was established and compared with the experimental results to verify its accuracy.The effects of parameters,including different height-to-width ratios and ratios of section spacing to the column outer diameter,on the specimens'elastic stiffness and bearing capacity were analyzed.The re-sults indicated that reducing the height-to-width ratio and the ratio of section spacing to column outer diameter significantly improved the stress performance of CFST lattice columns.It is suggested that in practical engineering,the height-to-width ratio of the columns should not exceed 4.8,and the ratio of spacing between limbs to column outer diameter should not exceed 7.0.

关 键 词：钢管混凝土 格构柱 拟静力试验 参数分析 抗震性能 有限元分析 

分 类 号：TU393[建筑科学—结构工程]