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考虑了几何缺陷、残余应力和材料塑性,采用大变形理论自编程序3D-Steel-Struct对工字形压杆屈曲前后的变形曲线进行了研究。对非完善双轴对称工字形截面压杆进行了二阶弹性和二阶刚塑性的理论分析,推导了相应阶段的轴压力与变形之间的关系,构造了轴压力与跨中挠度和轴压力与轴向位移之间的解析表达式,并与数值解非常吻合。研究了压杆轴压延性随长细比的变化规律,提出了一个延性与长细比的近似表达式,并具有良好的精度。
Considering geometric defects, residual stress and material plasticity, the deformation curves before and after buckling of the I-shaped bar were studied by 3D-Steel-Struct, a self-programming program based on large deformation theory. The theoretical analysis of the second-order elastic and second-order rigid-plastic analysis of imperfect biaxially symmetric I-section beams was made. The relationship between the axial compression and deformation was derived and the relationship between shaft pressure and mid-span deflection and shaft pressure And axial displacement between the analytical expression, and numerical solution is very consistent. The variation law of the calendering force with the slenderness ratio was studied, and an approximate expression of ductility and slenderness ratio was proposed with good accuracy.