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讨论厂房中变截面柱设计中的屈曲问题。这些柱子的顶端和变截面处通常承受轴向偏心荷载,因此,柱子会产生弯矩。横向荷载产生的附加屈曲也必须考虑。基于这些因素,对几何非线性模型进行屈曲性能分析,并给出平衡微分方程。成功应用了两个柱段的等效(或有效)长度概念。考虑以下参数范围给出了有效长度系数:端部固定,端部与中间轴向荷载比,上、下段长度与惯性矩的比值以及连接处的力学性能。对临界荷载的缺陷敏感性进行研究。讨论不同偏心距和一次性施加横向荷载时柱的承载力变化。结果表明:上、下段可分别按照梁、柱单独处理。以交互方程的形式给出一些设计建议。
Discusses the buckling problem in the design of variable section columns in the workshop. These columns often bear axial eccentric loads at the top and at the cross-section, so that the column will have a bending moment. Additional buckling due to lateral loads must also be considered. Based on these factors, the buckling behavior of the geometric nonlinear model is analyzed and the equilibrium differential equation is given. The concept of equivalent (or effective) length of two bars has been applied successfully. The effective length coefficient is given by taking into account the following parameter ranges: end fixed, end-to-center axial load ratio, ratio of length to moment of inertia, and mechanical properties at the joint. The sensitivity of defects to critical loads is studied. Discusses the variation of column bearing capacity under different eccentricity and one-time lateral load. The results show that the upper and lower sections can be treated separately according to beams and columns. In the form of interactive equations to give some suggestions.