钢管膨胀混凝土圆柱轴压受力性能与承载力计算方法研究*
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（1 湖南城市学院规划建筑设计研究院，益阳 413000; 2 湖南城市学院土木工程学院，益阳 413000；3 湖南益晟机械科技有限公司，益阳 413064；4 湖南大学土木工程学院，长沙 410082）［摘要］通过4根低含钢率钢管混凝土圆柱的承载力试验，研究在不同荷载作用下4根圆柱的力学性能，对比钢管膨胀混凝土圆柱与普通钢管混凝土圆柱弹性泊松比的差异性，并探讨国内外钢管混凝土圆柱轴压极限承载力计算方法对低含钢率的适用性。试验研究表明：膨胀剂对钢管混凝土圆柱的轴压极限承载力影响不大；低含钢率钢管混凝土圆柱在各级荷载作用下表现出弹性、弹塑性和塑性三个工作阶段，且钢管膨胀混凝土圆柱与普通钢管混凝土圆柱横、纵向应变突变值相差较大；掺合膨胀剂的钢管混凝土圆柱在弹性阶段加载初期，泊松比接近于混凝土弹性泊松比，普通钢管混凝土圆柱在弹性阶段加载初期，泊松比接近于钢管的弹性泊松比。同时，依据钢管混凝土圆柱的破坏机理，分两种情况提出钢管混凝土圆柱轴压极限承载力的计算方法，经检验，该方法计算效果较好。［关键词］钢管膨胀混凝土; 轴压极限承载力; 理论分析; 试验研究中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2014)22-0036-05Research on mechanical performance and bearing capacity calculation method of expansive concrete filled steel tube columns under axial compressionChen Yongming1, Cao Guohui2, Chen Zhaohui3, Hu Jiaxing4(1 Research Institute of Planning Architecture Design, Hunan City University, Yiyang 413000, China; 2 College of Civil Engineering, Hunan City University, Yiyang 413000, China; 3 Hunan Yisheng Machinery Technology Co., Ltd., Yiyang 413064, China; 4 College of Civil Engineering, Hunan University, Changsha 410082, China)Abstract: Through bearing capacity tests on 4 low steel proportion of expansive concrete filled steel tube columns, mechanical performance of 4 cylinders at all levels of loads was studied. The difference of elastic poisson ratio between expansive concrete filled steel tube and ordinary concrete filled steel tube columns under various loads was compared. The axial compression ultimate bearing capacity calculation method of concrete filled steel tube with axial compression at home and abroad was discussed for the applicability of the low steel proportion. The experimental results show that expansion agent cannot influence the axial compression ultimate bearing capacity of concrete filled steel tube columns. Low steel proportion of concrete filled steel tube shows elastic, elastic-plastic and plastic stages of work at all levels of loads, and transverse and longitudinal strain mutation values are comparatively large different between expansive concrete filled steel tube and ordinary concrete filled steel tube columns. When the expansive concrete filled steel tube columns are in the early stage of elastic loading, the poisson ratio is close to the elastic poisson ratio of concrete; for ordinary concrete filled steel tube columns, the poisson ratio is close to the elastic poisson ratio of steel. Based on the failure mechanism of concrete filled steel tube, the calculation methods of axial compression ultimate bearing capacity for concrete filled steel tube in two different conditions were put forward. After the inspection, the effect of the calculation method is good.Keywords: expansive concrete filled steel tube; axial compression ultimate bearing capacity; theoretical analysis; experimental study*湖南省科技计划项目(2012FJ4235)，湖南省自然科学基金项目（14JJ4062）。作者简介：陈咏明，高级工程师，Email: 920516411@qq.com。参考文献［1］李斌. 钢管混凝土结构的研究［D］. 西安: 西安建筑科技大学, 2004.［2］肖海兵, 赵均海, 孙楚平, 等. 薄壁钢管轻骨料混凝土轴压短柱承载力分析［J］. 建筑结构, 2012, 42(11): 101-106.［3］幸坤涛, 岳清瑞. 高强钢管混凝土核心柱轴压短柱的承载力研究［J］. 钢结构, 2002, 17(1): 18-21.［4］蔡健, 谢晓锋, 杨春, 等. 核心高强钢管混凝土柱轴压性能的试验研究［J］. 华南理工大学学报：自然科学版, 2002, 30( 6) : 81-85.［5］张耀春, 王秋萍, 毛小勇, 等. 薄壁钢管混凝土短柱轴压力学性能试验研究［J］. 建筑结构, 2005, 35(1): 22-27.［6］聂建国, 赵洁, 柏宇, 等. 钢管混凝土核心柱轴压极限承载力［J］. 清华大学学报：自然科学版, 2005, 45(9): 1153-1156.［7］FURLONG R W. Concrete encased steel columns-design tables［J］. Journal of the Structural Division, 1974, 100(9): 1865-1882.
