H型钢连接L形方钢管混凝土组合异形柱偏压性能研究
引用文献：
闫翔宇 张天柱 张希 陈志华 刘洁. H型钢连接L形方钢管混凝土组合异形柱偏压性能研究[J]. 建筑结构，2023，48（03）：64-71.
YAN Xiangyu ZHANG Tianzhu ZHANG Xi CHEN Zhihua LIU Jie. Research on behavior of L-shaped columns composed of concrete-filled square steel tubes connected by H-shaped steel subjected to eccentric compression[J]. Building Structure，2023,48（03）：64-71.
摘要：为提升方钢管混凝土组合异形柱加工制作的便捷性与精度、减小焊接对板件变形的影响，提出了新型H型钢连接L形方钢管混凝土组合异形柱(LCFST-H),并研究其偏压荷载下的力学性能。设计了两个试件进行偏压加载试验，建立计算模型开展有限元分析。在验证有限元模型准确性的基础上，分析了H型钢连接板尺寸、方钢管截面尺寸、柱高度等参数对组合异形柱偏压受力性能的影响。结果表明：构件破坏形式为整体弯曲失稳与局部屈曲破坏，达到极限承载力后，单肢柱之间仍能通过H型钢连接板很好地协同工作，具备一定承载能力，体现出较高的延性性能。方钢管截面尺寸和柱高度对其偏压性能影响较大。结合相关规范，给出了H型钢连接L形方钢管混凝土组合异形柱单向偏压承载力计算公式，公式计算结果与有限元结果吻合较好。
关键词：L形方钢管混凝土组合异形柱；H型钢；偏压试验；参数分析；承载力计算；
基金：国家重点研发计划资助项目(2017YFC0703802)。
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[7] ZHOU TING,XU MINYANG,WANG XIAODUN,et al.Experimental study and parameter analysis of L-shaped composite column under axial loading[J].International Journal of Steel Structures,2015,15(4):797-807.
[8] XU MINYANG,ZHOU TING,CHEN ZHIHUA,et al.Experimental study of slender LCFST columns connected by steel linking plates[J].Journal of Constructional Steel Research,2016,127:231-241.
[9] 周婷，胥民扬，陈志华，等.L形钢板连接式方钢管混凝土组合异形柱双向压弯稳定性试验研究[J].建筑结构，2018,48(6):82-86.
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[11] ZHANG WANG,CHEN ZHIHUA,XIONG QINGQING.Performance of L-shaped columns comprising concrete-filled steel tubes under axial compression[J].Journal of Constructional Steel Research,2018,145:573-590.
[12] 亢景付，张希，闫翔宇.H型钢连接方钢管混凝土组合异形柱轴压性能试验研究[J].天津大学学报(自然科学与工程技术版),2019,52(S2):134-141.
[13] 陈志华，于敬海，曹爽秋，等.一种基于高频焊 H 型钢的方钢管混凝土组合异形柱：ZL201710966894.3[P].2018-04-13.
Research on behavior of L-shaped columns composed of concrete-filled square steel tubes connected by H-shaped steel subjected to eccentric compression
Abstract: In order to improve the fabrication convenience and precision and reduce the welding effect on the deformation of steel plates for special-shaped columns composed of concrete-filled square steel tubes, a new type of L-shaped columns composed of concrete-filled square steel tubes connected by H-shaped steel(LCFST-H) was proposed, and the mechanical performance of this new LCFST-H column under eccentric compression was studied. Two specimens were designed to carry out eccentric compression loading test, and calculation model was established to carry out the finite element analysis. Based on the verifying the accuracy of the finite element model, the parametric study was conducted to investigate the effects of the sectional dimensions of the H-shaped steel connection plate and spuare steel tube, and the column height on the mechanical performance of L-shaped column under eccentric compression. The results show that the failure mode of the LCFST-H columns is bending instability accompanied with local buckling. The mono-columns work cooperatively with the H-shaped steel connection plate after reaching the ultimate load and the specimens maintain considerable carrying capacity, reflecting high ductility level. Sectional dimensions of square steel tube and the column height have significant influences on the eccentric compression behavior of the LCFST-H columns. The calculation formula of unidirectional bearing capacity of LCFST-H column under eccentric compression is given in combination with relevant specifications. The calculation results of formula and results of finite element are consistent with each other.
Keywords: L-shaped column composed of concrete-filled square steel tube; H-shaped steel; eccentric compression experiment; parametric analysis; bearing capacity calculation
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