(1 天津大学建筑设计规划研究总院有限公司, 天津 300073; 2 天津大学建筑工程学院, 天津300072; 3 滨海土木工程结构与安全教育部重点实验室 (天津大学), 天津 300072)

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

中图分类号:TU398. 9 文献标志码:A 文章编号:1002-848X(2023)03-0064-08

DOI:10. 19701 / j. jzjg. 20201116

Research on behavior of L-shaped columns composed of concrete-filled square steel tubes connected by H-shaped steel subjected to eccentric compression

YAN Xiangyu1,2, ZHANG Tianzhu1, ZHANG Xi1, CHEN Zhihua2,3, LIU Jie2

(1 Tianjin University Research Institute of Architectural Design and Urban Planning Co. , Ltd. , Tianjin 300073,China; 2 School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3 Key Laboratory of CoastCivil Structure Safety of the Ministry of Education (Tianjin University), Tianjin 300072, China)

Abstract:In order to improve the fabrication convenience and precision and reduce the welding effect on the deformation ofsteel plates for special-shaped columns composed of concrete-filled square steel tubes, a new type of L-shaped columnscomposed of concrete-filled square steel tubes connected by H-shaped steel(LCFST-H) was proposed, and the mechanicalperformance of this new LCFST-H column under eccentric compression was studied. Two specimens were designed to carryout eccentric compression loading test, and calculation model was established to carry out the finite element analysis. Basedon the verifying the accuracy of the finite element model, the parametric study was conducted to investigate the effects of thesectional dimensions of the H-shaped steel connection plate and spuare steel tube, and the column height on the mechanicalperformance of L-shaped column under eccentric compression. The results show that the failure mode of the LCFST-Hcolumns is bending instability accompanied with local buckling. The mono-columns work cooperatively with the H-shapedsteel connection plate after reaching the ultimate load and the specimens maintain considerable carrying capacity, reflectinghigh ductility level. Sectional dimensions of square steel tube and the column height have significant influences on theeccentric compression behavior of the LCFST-H columns. The calculation formula of unidirectional bearing capacity ofLCFST-H column under eccentric compression is given in combination with relevant specifications. The calculation resultsof 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 compressionexperiment; parametric analysis; bearing capacity calculation

∗国家重点研发计划资助项目(2017YFC0703802).

第一作者:闫翔宇,博士,高级工程师,一级注册结构工程师,主要从事钢结构、空间结构和组合结构等领域的技术研发,Email:xy_yan2005@ 163. com.

[引用本文] 闫翔宇,张天柱,张希,等. 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,2023,53 ( 3): 64-71. YAN Xiangyu, ZHANG Tianzhu, ZHANG Xi, et al. Research on behavior of L-shaped columnscomposed of concrete-filled square steel tubes connected by H-shaped steel subjected to eccentric compression [ J].Building Structure,2023,53(3):64-71.