（天津大学建筑工程学院， 天津 300072）
［摘要］在分析L形方钢管混凝土组合异形柱特点的基础上，通过理论计算、有限元分析得到了异形柱的破坏形态及轴压极限承载力，并采用叠加理论推导了其换算长细比的计算公式。轴压试验得到了计算模型的荷载-位移曲线，单肢挠度曲线以及单肢荷载-应变曲线。分析结果可知，叠加理论计算、有限元分析以及轴压试验的结果一致表明，异形柱的破坏形态为弯扭屈曲，同时三种方法得到的轴压极限荷载吻合较好，验证了采用叠加理论计算异形柱承载力的可行性。
［关键词］L形组合柱;方钢管混凝土;叠加理论;稳定性;轴压试验
Research on axial compression stability of L-shaped column composed of concrete-filled square steel tubes
Chen Zhihua, Rong Bin(School of Civil Engineering, Tianjin University, Tianjin 300072，China)
Abstract:Based on characteristics of L-shaped column composed of concrete-filled square steel tubes, research on calculation method and mechanical property for the special-shaped column is done by three methods: superposition theory, finite element analysis and axial compression experiment. The failure mode and ultimate bearing capacity under axial compression are achieved by theoretical calculation and finite element analysis. And the formula for conversion slenderness ratio is derived by superposition theory. By axial compression experiment, the curves of loading-displacement for the whole member, the curves of deflection and loading-strain for mono column are got. The results all show that the column has a flexural-torsional buckling failure mode. Also the ultimate loads under axial compression attained by the three methods accord with each other well, and the feasibility of calculating the bearing capacity of the special-shaped column by superposition theory is proved.
Keywords:L-shaped composite column; concrete-filled square steel tubes; superposition theory; stability; axial compression
基金项目：建设部科学技术项目(02-2-5-6)；天津市建设系统科学技术发展资助项目（200429）；新世纪优秀人才支持计划(2006)。
作者简介：陈志华，教授，博导，Email:zhchen@tju.edu.cn。
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