建筑结构学报2026，Vol.47Issue(7)：141-151,164,12.DOI:10.14006/j.jzjgxb.2025.0528
腹板开边缘加劲孔的折叠翼缘冷弯薄壁C形钢受弯构件稳定性能研究
Stability performance of folded-flange cold-formed thin-walled C-shaped steel flexural members with edge-stiffened holes in webs
摘要
Abstract
In order to investigate the effect of edge-stiffened holes in webs on the stability performance of folded-flange cold-formed thin-walled C-shaped steel flexural members,stability tests and finite element simulations were conducted on three types of specimens-specimens without web holes(Fl),specimens with ordinary web holes(F2),and specimens with edge-stiffened web holes(F3)under pure bending and combined bending and shear conditions.The results show that edge stiffening suppresses local buckling in hole regions under pure bending and weakens its coupling with distortional buckling.Specifically,F1 and F3 specimens fail in distortional buckling,whereas F2 specimens exhibit interactive local-distortional buckling.Under combined bending and shear,edge stiffening improves web shear transfer performance and reduces deformation around holes under bending-shear coupling.Specifically,F1 and F3 specimens both exhibit interactive buckling of local and distortional modes,while F2 specimens underwent local buckling.Compared with F1 specimens under identical conditions,the flexural capacities of F2 and F3 specimens decrease by 7.55％and 3.49％(pure bending),and by 35.46％and 8.18％(bending-shear coupling),demonstrating that edge stiffening of holes can significantly mitigate the reduction in load-carrying capacity of perforated specimens under bending-shear coupling.In addition,referring to the methods in relevant literature,a reduced plate thickness formula was established for F3 specimens to determine the critical elastic distortional buckling stress,and a direct strength method(DSM)study was carried out on the flexural capacities of the three types of cold-formed thin-walled C-shaped steel under pure bending.The results show that the flexural capacity predictions obtained using the proposed formula agree well with the test results and exhibit low scatter.关键词
冷弯薄壁C形钢/折叠翼缘截面/边缘加劲孔/静力试验/有限元分析/稳定性能/弹性畸变屈曲临界应力/直接强度法Key words
cold-formed thin-walled C-shaped steel/folded flange section/edge-stiffened holes/static test/FEA/stability behavior/critical elastic distortional buckling stress/direct strength method分类
建筑与水利引用本文复制引用
陈立平,王春刚,张壮南,赵泓权,王锘桓..腹板开边缘加劲孔的折叠翼缘冷弯薄壁C形钢受弯构件稳定性能研究[J].建筑结构学报,2026,47(7):141-151,164,12.基金项目
国家自然科学基金项目(52578224). （52578224）
