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基于有限元软件ABAQUS建立双肢钢管混凝土格构柱的分析模型,对已有试验的荷载-变形全过程进行数值模拟,有限元分析结果与试验结果吻合良好。在此基础上,进行了双肢钢管混凝土格构柱平面内、外受力性能分析以及影响因素分析。研究结果表明:在加载初期,构件平面内外方向的刚度相当,随着荷载的增加,构件平面外方向比平面内方向提前进入弹塑性阶段,使得平面外荷载提前到达峰值荷载,延性较差。此外,荷载偏心率和换算长细比的增加都会使双肢钢管混凝土格构柱的受压极限承载力下降,不过相对于换算长细比的增加,荷载偏心率的增加对极限承载力下降的影响更为显著。
Based on the finite element software ABAQUS, the analytical model of double-skinned concrete-filled steel tubular column is established. The whole process of load-deformation of the existing test is numerically simulated. The results of the finite element analysis agree well with the experimental results. On this basis, the in-plane and out-of-plane stress analysis of the concrete filled steel tubular column with double-limbs and the analysis of the influencing factors are carried out. The results show that in the initial stage of loading, the stiffness in the plane and in the plane of the component is equivalent. As the load increases, the out-of-plane direction of the component advances earlier than the in-plane direction into the elasto-plastic stage. In addition, the load-bearing eccentricity and the slenderness ratio increase will decrease the ultimate compressive load capacity of the two-legged CFST. However, relative to the increase of the slenderness ratio, the increase of load eccentricity will decrease the ultimate bearing capacity The impact is more significant.