【作者】 万红霞； 李光辉； 谭冬梅；

【Author】 WAN Hongxia;LI Guanghui;TAN Dongmei;School of Civil Engineering and Architecture, Wuhan University of Technology;

【机构】 武汉理工大学土木工程与建筑学院；

【摘要】 对于弯扭联合作用下冷弯薄壁C形钢梁的受力性能进行弹性分析和非线性有限元分析,考虑两种偏心情况,正偏心和负偏心,以及不同的跨长和偏心距值。分析表明,在正偏心情况下,C形钢梁截面腹板上部易发生局部屈曲;在负偏心情况下,C形钢梁截面易出现上翼缘-卷边的畸变屈曲。对于极限状态下弯矩和扭矩的相关关系进行研究,现行冷弯薄壁型钢结构设计规范的线性相关方程可以安全地计算C形钢梁在正偏心情况下的承载力,但对于负偏心情况则不够安全。在有限元分析结果的基础上,提出了更合理的承载力计算方法。更多还原

【Abstract】 This research investigates the structural behaviour and strength of cold-formed C-section beams subject to combined bending and torsion actions through elastic and nonlinear finite element analyses. Two eccentric loading conditions, positive eccentricity loading and negative eccentricity loading, with varying spans and eccentricities, were considered. The analyses showed that local buckling occurs on the top of the C-section web under positive eccentricity loading but top flange-lip distortional buckling occurs under negative eccentricity loading. The interaction between the ultimate bending and torsional moment capacities was studied, it was found that the linear interaction equation of current technical code of cold-formed thin-wall steel structures can predict the load carrying capacity of C-section beams under positive eccentricity loading safely, but it is unsafe for negative eccentricity loading condition. Based on finite element analysis results, a more reasonable design method was proposed.更多还原