复杂卷边冷弯薄壁槽型钢梁畸变屈曲承载力研究  

Study on Distortional Buckling Capacity of Cold-formed Thin-walled Complex Lipped Channel Steel Beams

作　　者：程睿[1,2] 吕荣俊 刘子豪 程亮亮 崔佳[1,2] Cheng Rui;Lyv Rongjun;Liu Zihao;Cheng Liangliang;Cui Jia(Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,400045,China;School of Civil Engineering,Chongqing University,400045,China)

机构地区：[1]山地城镇建设与新技术教育部重点实验室(重庆大学),400045 [2]重庆大学土木工程学院,400045

出　　处：《特种结构》2020年第3期78-84,共7页Special Structures

基　　金：国家自然科学基金(51678060)。

摘　　要：为研究复杂卷边槽型截面钢梁的畸变屈曲承载力,对该截面梁的畸变屈曲性能进行试验研究和有限元分析,获得其变形性能和极限承载力,探讨了二次卷边宽度对复杂卷边槽钢梁畸变屈曲承载力的影响规律。结合试验和有限元分析结果,对北美规范的受弯构件畸变屈曲承载力的直接强度法公式应用于复杂卷边槽钢梁的适用性进行了分析评价。在此基础上,基于对现有直接强度法公式的修正,提出了冷弯薄壁复杂卷边槽钢梁畸变屈曲承载力的计算公式。In order to study the distortional buckling capacity of steel beams with complex lipped channel section,the distortion buckling performance of those beams was experimentally tested and finite element analysis was performed to obtain their deformation properties and ultimate bearing capacities.The influence of secondary lip width on the distortion buckling capacity was also discussed.Combining the test results and finite element analysis results,the applicability of the direct strength method formula,which are accepted in North American code for the distortion buckling bearing capacity of complex lipped channel steel beams,was analyzed and evaluated.Based on this study,modification to existing direct strength method formula for cold-formed thin-walled complex lipped channel steel beam was proposed.

关 键 词：复杂卷边冷弯槽钢梁 畸变屈曲 直接强度法 承载力 

分 类 号：TU392.1[建筑科学—结构工程]