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弹性屈曲荷载并不能直接看作是承载力,实际压杆存在初始弯曲,在弹塑性阶段失稳,需要改用极限承载力理论来确定压杆的稳定承载力。通过欧拉公式提供中间参数得到换算长细比的计算稳定系数,从而得到构件的承载能力。因此《钢结构设计规范》采用换算长细比来查稳定系数φ,计算构件的极限承载力。然而规范给出的换算长细比公式缺乏一致性,是一个分段函数。由压杆弯曲失稳和扭转失稳互相作用得到启发,提出双角钢组合T形截面和等边单角钢绕对称轴弯扭失稳换算长细比的一致性公式。
The elastic buckling load can not be directly regarded as the bearing capacity, but the initial bending of the actual compression rod is instability in the elastoplastic phase. Therefore, the ultimate bearing capacity theory needs to be changed to determine the stable bearing capacity of the compression rod. The Euler formula is used to provide the intermediate parameters to calculate the calculated stability factor of the slenderness ratio, so as to obtain the bearing capacity of the component. Therefore, “Code for the design of steel structures” using the conversion slenderness ratio to check the stability coefficient φ, calculate the ultimate bearing capacity of components. However, the specification gives the conversion slender than the lack of consistency, is a piecewise function. Inspired by the interaction between bending instability and torsional instability of the compression rod, the consistency formula of the slenderness ratio of the double-angle steel combined T-section and the equilateral single-angle steel around the symmetry axis is proposed.