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（1 湖南大學(xué)土木工程學(xué)院， 長(zhǎng)沙 410000； 2 工程結(jié)構(gòu)損傷診斷湖南省重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410000）

［摘要］為提高鋼管混凝土長(zhǎng)柱的穩(wěn)定承載能力以及抗震性能，采用在長(zhǎng)柱周邊增加分肢柱的組合結(jié)構(gòu)形式，對(duì)比研究了軸壓作用下的組合柱受力性能，完成了兩個(gè)分肢組合柱試件的軸壓試驗(yàn)，即灌混凝土組合長(zhǎng)柱與未灌混凝土組合長(zhǎng)柱試件。試驗(yàn)過程中主要獲取了組合柱的承載能力、破壞形態(tài)、內(nèi)力分布等數(shù)據(jù)。試驗(yàn)結(jié)果表明，采用分肢組合柱可以顯著提高鋼管混凝土長(zhǎng)柱的穩(wěn)定承載能力，其極限承載能力由強(qiáng)度控制，周邊分肢柱分擔(dān)了約50%的豎向荷載；灌混凝土組合長(zhǎng)柱的整體受力特性顯著改善，極限承載能力大幅提高，且在軸壓作用下最終破壞由上部單柱控制?；谠囼?yàn)結(jié)果，結(jié)合穩(wěn)定理論基本原理，將組合柱簡(jiǎn)化為一變截面柱進(jìn)行穩(wěn)定承載能力計(jì)算，并對(duì)上柱長(zhǎng)度、下柱長(zhǎng)度、下柱層數(shù)等因素對(duì)組合柱承載能力的影響進(jìn)行了探討。

［關(guān)鍵詞］鋼管混凝土； 長(zhǎng)柱； 分肢組合柱； 軸壓穩(wěn)定性； 穩(wěn)定計(jì)算

中圖分類號(hào)：TU311-2, TU392文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)19-0065-06

Experimental study on axial compression stability performance of concrete filled steel tube columns

Yang Xiao1， He Qingfeng1，2， Liu Yiren1， Yi Weijian1，2

(1 Department of Civil Engineering, Hunan University, Changsha 410000, China；2 Hunan Key Laboratory of Engineering Structure Damage Diagnosis, Changsha 410000, China)

Abstract:In order to improve the stability bearing capacity  and seismic performance of concrete filled steel tubular long columns, a composite structure with splitting columns around the long column  was adopted.  The axial compression tests of two split combined columns were completed, including the steel tubular long column filled with concrete and the column without concrete. The load bearing capacity, failure mode and internal force distribution of the composite column were obtained in the experiment. Test results show that the split combined column proposed  can significantly improve the stability bearing capacity of concrete filled steel tubular long columns and its ultimate bearing capacity is controlled by the strength, and about half of the vertical load is shared by the peripheral limb columns. The overall mechanical performance of the combined long column filled with concrete is significantly improved and the ultimate bearing capacity is greatly improved. Besides, the ultimate failure of the composite columns under axial compression is controlled by the upper single column. Based on the experimental results, combined with the basic principle of stability theory, the composite column was simplified into a variablesection column for the calculation of the stability bearing capacity, and the influence of the factors such as the length of the upper column, the length of the lower column and the number of the lower column on the bearing capacity of the combined column were discussed.

Keywords:concrete filled steel tube; long column; split combined column; axial compression stability; stability calculation

*既有工業(yè)建筑非工業(yè)化改造技術(shù)研究（2016YFC0701308）,國(guó)家自然科學(xué)基金(51108170)，中央高?；究蒲袠I(yè)務(wù)費(fèi)資助。

通訊作者：何慶鋒，博士，高級(jí)工程師，Email：5672101@qq.com。