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本文把夹层梁理论、缺陷杆的有效轴压刚度概念和格构柱的特点结合起来建立了格构柱的夹层梁——相关屈曲理论,它可用于研究各种缺陷对柱承载力的影响和柱肢弯曲与整体弯曲的相互作用。通过例子得到如下结论:(1)存在着不利的局部弯曲和整体弯曲的相互影响,(2)柱肢临界应力可作为格构柱的“受压屈服应力”使用,(3)完全弹性格构柱会发生极值型失稳。本文还简单地讨论了单肢验算法的理论依据及其合理性,提出了一新的剪力取值公式。
In this paper, the sandwich beam theory, the concept of effective axial compression stiffness of defective rods and the characteristics of lattice columns are combined to create a sandwich beam of lattice columns—the related buckling theory. It can be used to study the influence of various defects on the bearing capacity of columns. The interaction between the limb flexion and the overall bending. The following conclusions are obtained through the examples: (1) There are adverse local bending and overall bending interactions, (2) the critical stress of the column limb can be used as the “stress yield stress” of the lattice column, and (3) the fully elastic lattice. Extreme instability occurs in the column. This paper also briefly discusses the theoretical basis and rationality of the single-limb test algorithm, and proposes a new shear force formula.