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LOCAL AND DISTORTIONAL BUCKLING OF COLD-FORMED C AND Z-SECTION MEMBERS UNDER AXIAL COMPRESSION
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摘要: 采用解析法研究翼缘-卷边截面的畸变屈曲,采用翼缘和卷边并联抵抗弯曲荷载的模型,提出卷边截面的等效抗弯刚度计算公式。采用解析法分析了Z形和C形截面轴压时的屈曲,得到了局部屈曲和畸变屈曲的临界应力、屈曲系数及其对应的半波长。并提出了精度良好,大部分情况下是略偏安全的计算公式。Abstract: It was analyzed the distortional buckling of the flange-lip section in closed form solution. Through modelling the flange-lip section as a parallel system resisting bending loads, it was also proposed formulas to calculate the equivalent bending rigidity of the lip. Using the analytic methods，the bucklings of Z and C sections under axial loading were investigated. The critical stresses of local and distortional bucklings，buckling factors，together with buckling wave-length. Approximate formulas with excellent accuracy were proposed.
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Key words:
- local buckling /
- distortional buckling /
- cold-formed section steel
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[2] Teng J G, Yao J, Zhao Y.Distortional Buckling of Channel Beam-Columns［J].Thin-Walled Structures, 2003, 41(7):595-617. Lau S C W,Hancock G J.Distortional Buckling Formulas forChannel Columns［J].J Struct Eng ASCE,1987,113:1063-1078. [3] 陈绍蕃.卷边槽钢的局部相关屈曲和畸变屈曲［J].建筑结构学报, 2002, 23(1):27-31. [4] 吕烈武, 沈世钊, 沈祖炎, 等.钢结构构件稳定理论［M].北京:中国建筑工业出版社, 1983. [5] GB 500182002 冷弯薄壁型钢结构技术规范［S]. [6] Column Research Committee of Japan.Handbook of StructuralStability[M].Tokyo: Corona Publishing Company Ltd, 1971. -
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