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（1 南京工業(yè)大學(xué)土木工程學(xué)院， 南京 211800; 2 河海大學(xué)土木交通工程學(xué)院， 南京 210098)

［摘要］開(kāi)展了18根Q345鋼管自密實(shí)混凝土短柱的軸壓力學(xué)性能試驗(yàn)研究，分析核心混凝土強(qiáng)度、鋼管徑厚比對(duì)鋼管自密實(shí)混凝土短柱軸壓承載力、破壞模式、套箍效應(yīng)等力學(xué)性能的影響。采用有限元軟件ANSYS對(duì)鋼管自密實(shí)混凝土短柱軸壓力學(xué)性能進(jìn)行數(shù)值仿真分析，所得有限元計(jì)算值與試驗(yàn)結(jié)果吻合較好。研究表明：根據(jù)鋼管對(duì)核心混凝土約束作用的強(qiáng)弱，鋼管自密實(shí)混凝土軸壓短柱主要呈現(xiàn)兩種破壞模式：剪切型破壞和腰鼓型破壞。自密實(shí)混凝土強(qiáng)度越高，試件承載力越大?；谝淹瓿傻脑囼?yàn)成果及《鋼管混凝土結(jié)構(gòu)技術(shù)規(guī)程》（GB 50936—2014），提出安全可靠的軸壓承載力計(jì)算公式。

［關(guān)鍵詞］鋼管混凝土； 自密實(shí)混凝土； 套箍效應(yīng)； 極限承載力

中圖分類號(hào)：TU398+9，TU312文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)23-0066-06

Experimental study on mechanical performance of Q345 steel stub columns filled with self-compacting concrete under axial compression

Liu Ye1, Zhang Dachang1, Li Buhui2

(1 College of Civil Engineering, Nanjing University of Technology, Nanjing 211800, China; 2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China)

Abstract:An experimental study on  18 Q345 steel stub columns filled with self-compacting concrete was done under axial compression to investigate the mechanical behavior. The influence of the strength of core concrete and the diameter thickness ratios on the mechanical performance  such as bearing capacity, failure modes and confining effect of the stub columns was discussed in detail. ANSYS was used to simulate the stub columns filled with self-compacting concrete under axial compression, and the results of finite element analysis have reached a great agreement with the experimental datum. The results show that the stub columns mainly failure in two modes, that is shear mode and drum mode, according to the confined concrete by steel tube. The higher strength of the self-compacting concrete is, the greater the bearing capacity will be. Based on the experimental results and technical code for concrete filled steel tabular structures (GB 50936—2014), the formula which is safe and reliable to calculate the bearing capacity of the stub columns was proposed.

Keywords:concrete-filled steel tube; self-compacting concrete; confining effect; ultimate bearing capacity

*2014年江蘇省科技廳前瞻性聯(lián)合研究（BY2014005\|11）。

作者簡(jiǎn)介：劉業(yè), 碩士研究生, Email: liuye_1123@126.com。