姜亦鑫

摘要：为研究支吊架用卷边槽钢压弯构件的稳定性，采用有限元法进行屈曲模态仿真试验，分析截面尺寸、偏心距、长细比等因素对构件屈曲模态的影响，并与《冷弯薄壁型钢结构技术规范》（GB 50018—2002）中稳定性计算公式的结果进行对比，结果表明：随着腹板高度和板厚的增大，稳定承载力增大;随着偏心距和长细比的增大，稳定承载力降低;构件均未出现局部屈曲与畸变屈曲。有限元法得到的稳定承载力与《冷弯薄壁型钢结构技术规范》中计算公式的预测值基本一致，说明该规范中的计算方法适用于支吊架用卷边槽钢压弯构件的稳定性计算。

关键词：

卷边槽钢; 弯曲屈曲; 弯扭屈曲; 模态; 稳定性

中图分类号：TU392.1;TB115.1

文献标志码：B

Global stability calculation on lipped channel compression

flexural member for support and hanger

JIANG Yixin

（School of Civil Engineering， Shandong Jianzhu University， Jinan 250101， China）

Abstract：

To study the stability of the lipped channel compression flexural member for supports and hangers， the buckling modes are simulated using finite element method. The influences of the section size， the eccentricity and the slenderness ratio on the buckling modes are analyzed， and then the results are compared with those of the stability calculation formula in technical code of cold-formed thin-walled steel structures（GB 50018—2002）. The comparation results show that： the stability bearing capacity increases with the increase of the web height and the plate thickness; the stability bearing capacity decreases with the increase of the eccentricity and the slenderness ratio; there is no local buckling and distortion buckling on the members. The stability bearing capacity obtained by the finite element method is basically consistent with the predicted value of the calculation formula in technical code of cold-formed thin-walled steel structures， and it shows that the calculation method in the technical code is suitable for the stability calculation on lipped channel compression flexural member for supports and hangers.

Key words：

lipped channel; flexural buckling; torsional-flexural buckling; modal; stability

0 引 言

支吊架用卷邊槽钢是近年新兴起的一种冷弯型钢，其截面比普通C型卷边槽钢多1个卷边，其宽厚比远大于普通冷弯型钢的宽厚比限值。针对冷弯薄壁单轴对称开口截面压弯构件的稳定性，国内外研究较多。SCHAFER等[1]利用直接强度法计算冷弯型钢构件的强度;何保康等[2]研究冷弯薄壁型钢板件屈曲性能，发现直接强度法可以计算畸变屈曲构件的承载力;王春刚等[3]对冷弯薄壁压弯钢构件进行理论分析和试验验证，发现直接刚度法和修正有效宽度法对可靠度评价是有效的;尹凌峰等[4]采用直接强度法和参数化有限元法研究冷弯薄壁开口多卷边钢柱的屈曲特性，发现短柱失稳以畸变屈曲为主，长柱失稳以……