加劲对冷弯薄壁卷边槽钢局部和畸变耦合屈曲作用  

Effect of stiffener on local and distortional coupled buckling of cold-formed thin-walled lipped steel with channel section

作　　者：黄丽华 康磊 HUANG Lihua;KANG Lei(Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《大连理工大学学报》2021年第5期514-521,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51778113,51678115).

摘　　要：为了研究加劲形式和尺寸对冷弯薄壁卷边槽钢局部和畸变耦合屈曲的作用,采用无劲截面、腹板加劲、翼缘加劲、腹板和翼缘均加劲4种截面形式的冷弯薄壁卷边槽钢柱,开展轴心受压试验研究.结果表明:相对于无加劲试件,加劲后试件的屈曲荷载均有所提升,其中腹板加劲及腹板和翼缘均加劲后抗局部屈曲效果明显,压杆的失效形式从局部屈曲向局部和畸变耦合屈曲以及畸变屈曲模式转变.进一步采用有限元方法分析了加劲尺寸对屈曲性能的影响.计算结果表明,腹板加劲深度与翼缘宽度之比约为0.12,加劲宽度与腹板高度之比约为0.2时,薄壁卷边槽钢的屈曲承载力提升幅度最大,且主要发生畸变屈曲.In order to study the effect of stiffener type and dimension on local and distortional coupled buckling of cold-formed thin-walled lipped steel with channel section,an axial compression test is carried out on four types of cold-formed thin-walled lipped channel steel column including unstiffened,web stiffened,flange stiffened,web and flange stiffened simultaneously.The results show that the buckling loads of the specimens with stiffener are increased compared with those without stiffener,among them the anti-local buckling effect of web stiffened and web and flange stiffened is obvious.The failure modes transform from local buckling,local and distortional coupled buckling to distortional buckling.The influence of stiffener dimension on buckling performance is further analyzed by using finite element method.From the calculation results,it can be drawn that when the ratio of the depth of the web stiffener to the width of the flange is about 0.12,and the ratio of the width of the stiffener to the width of the web is about 0.2,the buckling bearing capacity of the thin-walled lipped channel steel increases the most,and distortional buckling mainly occurs.

关 键 词：加劲 冷弯薄壁卷边槽钢 屈曲承载力 局部和畸变耦合屈曲 试验及计算研究 

分 类 号：TU312[建筑科学—结构工程]