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（1 廣西大學(xué)土木建筑工程學(xué)院， 南寧 530004； 2 廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室， 南寧 530004）

［摘要］為了研究帶開孔損傷方鋼管混凝土柱的破壞機(jī)理，設(shè)計(jì)了9個(gè)試件進(jìn)行軸心受壓試驗(yàn)研究，主要考慮開孔損傷率、混凝土強(qiáng)度等級(jí)、長(zhǎng)細(xì)比3個(gè)變化參數(shù)，通過試驗(yàn)觀察了試件的受力全過程及破壞形態(tài)，獲取帶開孔損傷方鋼管混凝土柱的破壞機(jī)制、荷載-位移以及荷載應(yīng)變?nèi)^程曲線，并對(duì)其進(jìn)行極限承載力的理論分析。研究結(jié)果表明，帶開孔損傷方鋼管混凝土柱的破壞形態(tài)表現(xiàn)為開孔處鋼管撕裂和試件局部鼓曲破壞；混凝土強(qiáng)度等級(jí)對(duì)試件的荷載-位移曲線的形狀影響不明顯，但隨著混凝土強(qiáng)度的提高，試件的承載力有較大的提升；試件表現(xiàn)出良好的延性，小開孔損傷時(shí)（體積開孔損傷率＜0.7%、截面開口損傷率＜2.5%），對(duì)方鋼管混凝土柱的承載能力和變形性能影響較小。最后提出了帶開孔損傷方鋼管混凝土柱的極限承載力計(jì)算方法，研究結(jié)果可為相關(guān)學(xué)科的科學(xué)研究和工程應(yīng)用提供參考。

［關(guān)鍵詞］開孔損傷; 方鋼管; 鋼管混凝土柱; 承載性能

中圖分類號(hào)：TU398      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2014)09-0009-06

Experimental study on axial compression capacity of concrete-filled square steel tubular columns with opening hole damage

Chen Zongping1,2, Chen Yuliang1, Zhong Ming1, Xue Jianyang2

 (1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2 Key Laboratory of Disaster Prevention and Structural Safety of  China Ministry of  Education, Guangxi University, Nanning 530004, China)

Abstract: In order to research the failure mechanism of concrete-filled square steel tubular columns with opening hole damage under axial compression loading, 9 specimens were studied. Three vary parameters such as opening hole damage rate, concrete strength grade and slenderness ratio were considered. In experiments, the whole process of stress and failure pattern was observed. The failure mechanism of concrete-filled square steel tubular columns with opening hole  damage and the complete curves of load-displacement and stress-strain were obtained, and theoretical analysis of the ultimate bearing capacity was carried out. The results show that the failure pattern of concrete-filled square steel tubular columns with opening hole damage is tearing damage of steel tube in the opening hole area and local drum bow damage. Effects of concrete strength grade on load-displacement curve of specimens are not obvious. With the increase of concrete strength, bearing capacity of specimens obviously increases. Specimens with opening hole damage still show good ductility. On condition of the small opening hole damage (volume opening hole damage rate＜0.7% and section damage rate <2.5%),  influence on the bearing capacity and deformation of concrete-filled steel tubular columns is small. Finally the ultimate bearing capacity calculation method of concrete-filled square steel tubular columns with opening hole damage was put forward. The research conclusions can provide reference for scientific researches and engineering applications.

Keywords: opening hole damage; square steel tube; concrete-filled steel tubular column; bearing capacity

*國(guó)家自然科學(xué)基金項(xiàng)目（50908057），“八桂學(xué)者”建設(shè)工程專項(xiàng)經(jīng)費(fèi)資助項(xiàng)目，廣西科技攻關(guān)項(xiàng)目（桂科攻12118023-3），廣西自然科學(xué)基金項(xiàng)目（2012GXNSFAA053203），廣西理工科學(xué)實(shí)驗(yàn)中心重點(diǎn)項(xiàng)目（LGZX201102）。

作者簡(jiǎn)介：陳宗平，博士，教授，博士生導(dǎo)師，Email：zpchen@gxu.edu.cn。

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