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(廣州大學(xué)風(fēng)工程與工程振動研究中心,廣州 510006)
摘要: 對 9 組共 27 個高強鋼管高強混凝土和高強鋼管普通混凝土短柱試件進行軸壓試驗,觀察并研究其荷載-位移曲線及破壞模式的異同.試驗結(jié)果表明:高強鋼管普通混凝土試件與鋼管高強混凝土試件的荷載-位移曲線存在明顯的區(qū)別,高強鋼管普通混凝土試件的延性優(yōu)于鋼管高強混凝土試件.鋼管約束能有效提高混凝土的極限承載力,對高強混凝土的提高尤為明顯,原本脆性的高強混凝土表現(xiàn)出一定的延性,且延性隨著套箍系數(shù)的增加而增加.所有試件按«鋼管混凝土結(jié)構(gòu)技術(shù)規(guī)范»(GB 50936—2014)公式的計算值與實測值均吻合良好,表明該公式不僅適用于高強鋼管普通混凝土,還適用于高強鋼管高強混凝土.
關(guān)鍵詞: 高強鋼管高強混凝土;軸壓試驗;極限承載力;荷載-位移曲線;套箍系數(shù)
中圖分類號:TU398 文獻標(biāo)志碼:A 文章編號: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
∗國家自然科學(xué)基金面上項目(51878188、51678169).
第一作者:曾志偉,碩士,主要從事新結(jié)構(gòu)和組合結(jié)構(gòu)研究,Email: zeng_zhiwei@ e. gzhu. edu. cn.
[引用本文] 曾志偉,黃永輝,陳碧靜,等. 高強鋼管高強混凝土短柱軸壓承載能力試驗研究[J]. 建筑結(jié)構(gòu),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.
