腹板开孔冷弯卷边槽钢双肢拼合梁的畸变屈曲研究  

Study on Distortional Buckling Behaviour of the Cold-formed Steel Built-up Channel Beams with Web Perforations

作　　者：赵笙惠 孙家贤 袁伟斌[1] 余南霆 ZHAO Shenghui;SUN Jiaxian;YUAN Weibin;YU Nanting(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023

出　　处：《四川轻化工大学学报（自然科学版）》2022年第2期79-84,共6页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：浙江省自然科学基金项目(Y19E080059)。

摘　　要：为了研究腹板开孔冷弯卷边槽钢双肢拼合梁的畸变屈曲性能,在已有相关弯曲实验的基础上,对不同螺钉间距、孔洞大小和孔洞间距的构件进行了有限元参数分析。结果表明:在特定截面参数下,双肢拼合构件可以表现为以畸变屈曲为主的畸变-局部相关屈曲模态;受畸变屈曲控制的构件弯曲承载力随孔径的增大而减小,且下降幅度随着孔高比的增大而增加;螺钉间距和孔洞间距对构件畸变屈曲承载力影响相对较小。最后,根据参数分析结果,提出了在畸变屈曲控制下腹板开孔冷弯卷边槽钢双肢拼合受弯梁的极限荷载修正公式。In order to study the distortional buckling performance of cold-formed steel(CFS)built-up channel beams with web perforations subject to pure bending,on the basis of the existing bending experiments,the parametric analyses based on various screw spacing,hole size and hole spacing are carried out.It is shown that the failure mode of CFS built-up channel beams with web perforations controlled by distortional buckling can be combined with distortional-local buckling.The bending capacity of the specimens controlled by distortional buckling decreases with the increase of hole size,and the decreasing range increases with the rise of the diameter-depth ratio,although the screw spacing and the hole spacing have relatively little influence on the bending capacity.Finally,according to the results of the parameter analysis,the ultimate load modified formulae of CFS built-up channel beams with web perforations under the control of the distortion buckling is proposed.

关 键 词：双肢拼合梁 腹板开孔 畸变屈曲 有限元参数分析 直接强度法 

分 类 号：TU392[建筑科学—结构工程]