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由于其高强度和重量轻的特点,冷弯薄壁型钢构件在现代钢结构中发挥了重要的作用。由细长型角钢组成的格构柱的性能和强度主要是由边角的局部屈曲和角钢与缀板间的扭转屈曲所决定的。此外,局部屈曲取决于边角宽厚比、角钢和缀板间的整体长细比以及柱的整体长细比的相互作用。通过线性材料有限元模型和几何有限元模型进行理论研究,研究参数包括不同边角宽厚比的格构柱截面、缀板间的整体长细比以及格构柱的整体长细比。分析得出一个完整的强度曲线,并通过使用不同长度的构件来研究不同的失效模式,如在缀板的角钢间产生的局部屈曲或扭转屈曲,或在构件产生整体屈曲。提出一个关于剪切变形影响因素和缀板细长型角钢截面的极限轴向荷载能力的试验方程。通过有限元预测轴向荷载缀板构件的强度,并将所提出的试验方程与使用北美和欧洲规范所获得的设计强度相比较。可知:按北美和欧洲规范所预测的设计强度偏于保守,通过可靠性分析验证了这些设计准则的可靠性。
Due to its high strength and light weight, cold-formed thin-walled sections play an important role in modern steel structures. The performance and strength of the lattice composed of slender angles are mainly determined by the local buckling of the corner and the torsional buckling between the angle and the slab. In addition, the local buckling depends on the aspect ratio, the overall slenderness ratio between the angle and the plate, and the overall slenderness ratio of the column. The finite element model of linear material and the geometric finite element model are used to study the parameters including the cross-section of the lattice columns with different aspect ratios, the overall slenderness ratio between the slabs and the overall slenderness ratio of the lattice columns. Analyze a complete strength curve and study different failure modes by using members of different lengths, such as local buckling or torsional buckling between the angles of the batten or overall buckling of the member. A test equation about the influence factors of shear deformation and ultimate axial load capacity of slab-thin angle section is presented. The strength of axially loaded panel members was predicted by finite element method and the proposed test equations were compared with those obtained using North American and European specifications. It can be seen that the design strength predicted by the North American and European codes is conservative and the reliability of these design criteria is verified by reliability analysis.