(广州大学风工程与工程振动研究中心,广州 510006)

摘要: 对 9 组共 27 个高强钢管高强混凝土和高强钢管普通混凝土短柱试件进行轴压试验,观察并研究其荷载-位移曲线及破坏模式的异同.试验结果表明:高强钢管普通混凝土试件与钢管高强混凝土试件的荷载-位移曲线存在明显的区别,高强钢管普通混凝土试件的延性优于钢管高强混凝土试件.钢管约束能有效提高混凝土的极限承载力,对高强混凝土的提高尤为明显,原本脆性的高强混凝土表现出一定的延性,且延性随着套箍系数的增加而增加.所有试件按«钢管混凝土结构技术规范»(GB 50936—2014)公式的计算值与实测值均吻合良好,表明该公式不仅适用于高强钢管普通混凝土,还适用于高强钢管高强混凝土.

关键词: 高强钢管高强混凝土;轴压试验;极限承载力;荷载-位移曲线;套箍系数

中图分类号:TU398 文献标志码:A 文章编号:1002-848X(2022)18-0072-06

DOI:10.19701 / j.jzjg.20201545

Experimental study on bearing capacity of short columns with high-strength concrete-filledhigh strength steel tubes under axial loading

ZENG Zhiwei,HUANG Yonghui,CHEN Bijing,TAN Dingrong

(Research Center for Wind Engineering and Engineering Vibration,Guangzhou University,Guangzhou 510006,China)

Abstract: Experimental investigation on 9 groups of 27 concrete filled high-strength steel tube (CFHST) and high-strengthconcrete-filled high-strength steel tube ( HSCFHST) short columns under axial compressive load was proposed. Thesimilarities and differences of load-displacement curves and failure modes between them were analyzed. The test resultsshow a significant difference between the load-displacement curves of CFHST and HSCFHST specimens. The ductility ofCFHST specimens is superior to that of HSCFHST. The steel tube’ s restraint can effectively improve the ultimate bearingcapacity of concrete,especially for the improvement of high-strength concrete. The original brittle HSCFHST obtains acertain ductility and the ductility increases with the increase of the confinement coefficient. The measured ultimate loads ofall the test specimens are in good agreement with the calculated values given by the formula in Technical specifications forconcrete filled steel tubular structures (GB 50936—2014),indicating that this formula presented by Chinese code appliesnot only to CFHST but also to HSCFHST.

Keywords: high-strength concrete-filled high-strength steel tube;axial compression test;ultimate capacity;load-displacement curve;confinement coefficient

∗国家自然科学基金面上项目(51878188、51678169).

第一作者:曾志伟,硕士,主要从事新结构和组合结构研究,Email: zeng_zhiwei@ e. gzhu. edu. cn.

[引用本文] 曾志伟,黄永辉,陈碧静,等. 高强钢管高强混凝土短柱轴压承载能力试验研究[J]. 建筑结构,2022,52( 18):72-77. ZENG Zhiwei,HUANG Yonghui,CHEN Bijing,et al. Experimental study on bearing capacity of shortcolumns with high-strength concrete-filled high strength steel tubes under axial loading[ J]. Building Structure,2022,52(18):72-77.