冷弯薄壁卷边槽钢轴心受压构件承载力计算的折减强度法  

Strength-reduction method for load-carrying capacity of cold-formed lipped channel columns under axial compression

作　　者：石宇[1] 周绪红[1,2] 苑小丽[2] 聂少锋[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《建筑结构学报》2010年第9期78-86,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(50578013)

摘　　要：为了研究冷弯薄壁卷边槽钢轴心受压构件的极限承载力,对15根轴心受压的冷弯薄壁卷边槽钢进行了破坏性试验,并采用有限元分析方法对试件进行模拟分析,有限元计算结果与试验结果吻合良好,验证了有限元方法的有效性,然后对典型截面构件进行大量的有限元参数分析。研究结果表明:冷弯薄壁卷边槽钢轴心受压构件的极限承载力随着构件翼缘宽厚比、腹板高厚比、长细比以及钢材强度的增大而减小。通过参数分析得到了考虑局部屈曲、整体屈曲和畸变屈曲影响的构件屈服强度折减系数,提出了冷弯薄壁卷边槽钢轴心受压构件承载力计算的折减强度法及其相应计算公式,且通过试验验证了本文折减强度法计算卷边槽钢轴心受压构件极限承载力的适用性。In order to study the ultimate load-carrying capacity of cold-formed lipped channel columns under axial compression,15 specimens were tested till failure,and tests were simuleted by fimite element analysis.The well fitting between finite element analysis and test results validates the finite element modeling presented in this paper.Based on extensive parametric analyses through the finite element model,it is found that with the increase of width-to-thickness ratio of flanges,height-to-thickness ratio of the web,slenderness ratio and steel strength,the ultimate loadcarrying capacity of cold-formed lipped channel columns under axial compression decreases.The yield strength reduction factors considering local,overall and distortional buckling are obtained from finite element analysis.Strength-reduction method for ultimate load-carrying capacity of cold-formed lipped channel columns under axial compression is proposed,which agrees well with the experimental results.

关 键 词：冷弯薄壁型钢 卷边槽钢 轴心受压构件 极限承载力 折减强度法 

分 类 号：TU392.1[建筑科学—结构工程]