腹板开孔冷弯卷边槽钢双肢拼合梁的整体屈曲性能研究  

Global buckling behavior of cold-formed steel built-upchannel beams with web perforations

作　　者：袁伟斌[1] 孙家贤 赵笙惠 余南霆 YUAN Weibin;SUN Jiaxian;ZHAO Shenghui;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,浙江杭州310023

出　　处：《浙江工业大学学报》2022年第5期473-479,共7页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(LY19E080020)。

摘　　要：为了研究腹板开孔冷弯卷边槽钢双肢拼合梁的整体屈曲性能,通过现有相关4点弯曲试验结果验证了非线性有限元模型的有效性,并对不同螺钉间距、孔洞大小、孔洞间距和构件长细比的构件进行了参数分析。结果表明:受整体屈曲控制的构件承载力随着螺钉间距增大而减小,但孔洞大小和间距对承载力影响较小;随着长细比的增加,构件的破坏模式由局部和畸变屈曲逐渐转为整体屈曲,构件的承载力随之降低。此外,根据参数分析结果考虑了长细比和螺钉间距对组合效应的影响,对整体屈曲控制单肢受弯构件的直接强度公式进行了修正。In order to investigates the global buckling behavior of cold-formed steel(CFS)built-up channel beams with web perforations,a non-linear finite element model is validated by the bending tests.A parameter analysis of specimens with various screw spacings,hole sizes,hole spacings,and slenderness ratios is performed.It is shown that the bending moment capacity of members subjected to global buckling decreases with the increase of screw spacing.However,the effect of hole size and hole spacing on the bending moment capacity of members is negligibly small.When the slenderness ratio increases,the failure mode of specimens turns from local/distortional buckling to global buckling and the bending moment capacity decreases.According to the parametric analysis,the current direct strength formula for single CFS beams with web perforations is modified by considering the effects of slenderness ratio and screw spacing.

关 键 词：卷边槽钢 双肢拼合梁 腹板开孔 整体屈曲 参数分析 直接强度公式 

分 类 号：TU392[建筑科学—结构工程]