中文摘要：

利用有限元软件ABAQUS建立椭圆形钢管混凝土长柱轴压力学性能分析的三维实体有限元模型,并进行相应的试验,有限元计算与试验所得的荷载-柱中挠度全过程曲线及长柱破坏形态吻合较好。在此基础上对其受力全过程中钢管及混凝土应力、应变分布情况进行分析,同时给出钢管与混凝土之间的相互作用,并对长细比、材料强度、钢管壁厚及截面尺寸等参数对轴压时长柱极限承载力及荷载-柱中挠度曲线的影响进行比较。结果表明：椭圆形钢管混凝土长柱在1/2柱高处发生侧向挠曲破坏,长细比等参数对其力学性能影响显著,钢管屈服强度对其力学性能影响不明显。

英文摘要：

A three-dimensional finite element analysis model for elliptical concrete-filled steel tubular long columns subjected to axial compression is developed and the corresponding tests are carried out .The predicted relationship curves of load versus deflection in the middle column height and damage modes are in good agreement with the measured results .The finite element analysis model is thus used to investigate the stress and strain distribution of each component and the interaction between the steel tube and the core concrete in the whole loading process .And then, the main parameters influencing the relationship curves of load versus deflection in the middle column height such as slenderness ratio , material strength , steel tube wall thickness and cross sectional dimension are investigated . The results show the typical failure modes of these columns were the lateral overall bending at about mid -height, the slenderness ratio have obvious effects on their mechanical behavior , while the yield strength of steel tube has slight effect on their mechanical behavior .