开孔冷弯薄壁卷边槽钢柱轴压性能的试验研究  

Experimental Investigation into Axial Compressive Behavior of Cold-Formed Thin-Walled Steel Columns with Lipped Channel and Openings

作　　者：姚永红[1] 武振宇[1] 成博[1] 邓君宝[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《华南理工大学学报（自然科学版）》2011年第9期61-67,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"十一五"科技支撑计划项目(2006BAJ01B02-01-04)

摘　　要：为研究腹板开孔具中间加劲肋的冷弯薄壁卷边槽钢构件的受压性能,对两种截面形式的短柱和中长柱共计16根轴压构件的承载力和屈曲模式进行了试验分析.结果表明:所有试件均发生畸变屈曲失效,中长柱试件还伴随有绕弱轴的整体弯曲;腹板孔洞导致构件屈曲模式发生变化,孔洞周边板件有局部屈曲产生;孔洞的存在使试件承载力降低,短柱试件承载力的减小幅度比中长柱试件的大;同组试件中畸变初始缺陷大的,一般承载力较小,畸变变形偏大;极限承载力下开孔构件的畸变变形一般大于未开孔构件.文中还对所有试件进行了有限元模拟,发现有限元分析结果与试验值吻合较好.In order to investigate the compression behavior of the cold-formed thin-walled steel columns with lipped channel, intermediate stiffener and openings in the web, 16 axial compressive members, including the short and the medium-length columns in two section forms, were experimentally analyzed in the aspects of bearing capacity and buckling mode. The results show that all of the specimens fail due to the distortional buckling and the mediumlength columns have additional overall bending around the weak axis, that the openings in the web result in the changes of buckling modes of the members and the local bucklings of the plates occur around the openings, and that, due to the effects of the openings, the bearing capacities of the specimens decrease and the decrement of the bearing capacity of the short column is greater than that of the medium-length one. Moreover, it is found that, for the specimens in the same test group, the columns with larger initial distortional imperfections are of lower bearing capacities and greater deformations induced by the distortional bucklings, and that the openings generally enhance the deformations corresponding to the ultimate bearing capacity. In addition, all of the tested specimens are simulated by means of the finite element method, finding that the simulated results accord well with the experimental ones.

关 键 词：冷弯薄壁型钢 卷边槽形截面 开孔 试验研究 畸变屈曲 有限元法 

分 类 号：TU392.1[建筑科学—结构工程]