建筑钢结构进展2025，Vol.27Issue(2)：34-44,11.DOI:10.13969/j.jzgjgjz.20230913002
折叠翼缘冷弯薄壁C型钢构件抗弯性能研究
Flexural Behavior of Folded Flange Cold-Formed Thin-Walled C-shaped Steel Members
摘要
Abstract
Bending the flange section of ordinary C-shaped steel section to form a folded flange section can reduce the width-to-thickness ratio of the flange and increase the height of the section,thereby improving the stability of the flexural members and enhancing the flexural bearing capacity.In order to study the flexural behavior of folded flange cold-formed thin-walled C-shaped steel members under pure bending,a numerical calculation model was established using the ABAQUS finite element software.The effects of the width-to-thickness ratio of the plates,the angle between the plates,and the relative dimensions of the plates on the ultimate bearing capacity,buckling failure mode,deformation characteristics and stress distribution of the members were analyzed,and compared with the flexural behavior of ordinary C-shaped steel members.On this basis,the calculation method of flexural bearing capacity was studied.The results show that the folded flange members have distortional buckling and local-distortional interaction buckling.The different combinations of flange and lip lead to two different types of distortional buckling.Under the same material usage,the bearing capacity of the members is maximized when the flange bending angle is 105° and the lip bending angle is 90°.When the angle between the plates is constant,with the increase in the ratio of the flange section width after bending,the flexural bearing capacity of the folded flange members gradually increases,and the increase range is about 14%-49%.In addition,the ultimate bearing capacity of the folded flange members was calculated using the direct strength method formula in AISI S100,and compared with the finite element analysis results.The results show that the flexural bearing capacity calculated by the direct strength method with local-global interactive buckling has a large degree of dispersion.According to the parametric analysis result,the direct strength method formula was modified.关键词
冷弯薄壁型钢/折叠翼缘截面/屈曲破坏模式/抗弯承载力/直接强度法Key words
cold-formed thin-walled steel/folded flange section/buckling failure mode/flexural bearing capacity/direct strength method分类
建筑与水利引用本文复制引用
王春刚,陈立平,张壮南..折叠翼缘冷弯薄壁C型钢构件抗弯性能研究[J].建筑钢结构进展,2025,27(2):34-44,11.基金项目
国家自然科学基金(51978422) （51978422）
