缀板加强冷弯薄壁C形钢受压极限承载力研究  

Research on Ultimate Compressive Load of CFS C-shaped Members Strengthened by Batten Plates

作　　者：姚欣梅 周绪红[2] 李权伦 石宇[2] 管宇[1] 姚斌 王强 YAO Xinmei;ZHOU Xuhong;LI Quanlun;SHI Yu;GUAN Yu;YAO Bin;WANG Qiang(School of Civil Engineering,Chang’an University,Xi’an 710061,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,Chongqing 400045,China;Guiyang Engineering Corporation Limited of Power China,Guiyang 550081,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045 [3]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《湖南大学学报（自然科学版）》2023年第11期79-88,共10页Journal of Hunan University:Natural Sciences

基　　金：陕西省自然科学基础研究计划项目(2022JQ-570,2022JM-227);中央高校基本科研业务费专项资金资助项目(300102282111);中国电建集团贵阳勘测设计研究院有限公司科技项目(YJZD2019-01)。

摘　　要：为研究缀板加强冷弯薄壁C形钢受压构件的受力性能,采用ANSYS软件建立其非线性有限元模型,并与试验破坏特征、极限承载力进行对比,验证建模方法的正确性.研究缀板间距及偏心距对缀板加强冷弯薄壁C形钢在轴压及单向偏心受压作用下的极限承载力及屈曲模态的影响规律.结果表明:随缀板间距减小,C形钢的屈曲变形由畸变屈曲逐步转为局部屈曲,轴心受压及偏心受压构件极限承载力逐渐增高;随偏心距增大,偏心受压构件的极限承载力逐渐降低;建议缀板加强冷弯薄壁C形钢轴压、偏压构件的缀板间距分别取λ/3、λ/4(λ为屈曲半波长度).基于缀板加强冷弯薄壁C形钢的受力特点及直接强度法,提出缀板加强冷弯薄壁C形钢构件轴压及偏压极限承载力的修正公式,并验证了公式的准确性.To study the mechanical behavior of Cold-formed Thin-walled Steel(CFS)C-shaped compression members strengthened by batten plates,the nonlinear finite element model of C-shaped steel was established by using ANSYS software.The correctness of the modeling method was verified by comparing the test failure characteristics and ultimate bearing capacities.The effects of batten spacing and eccentricity on the ultimate bearing capacity and buckling mode of batten-strengthened CFS C-section members under axial and one-directional eccentric compression were studied.The results showed that,with the decrease of batten plate spacing,the buckling deformation of C-shaped members changed gradually from distortion buckling to local buckling,and the ultimate bearing capacity of axial compression and eccentric compression members increased gradually.With the increase of eccentricity,the ultimate bearing capacity of eccentric compression members decreased gradually.It is suggested that the batten spacing of CFS C-shaped steel axial compression and eccentric compression members strengthened by batten plates should be taken asλ/3 andλ/4,respectively.Based on the mechanical characteristics and direct strength method of CFS C-shaped steel members strengthened by batten plates,a modified formula for the ultimate compressive capacity of CFS C-shaped members strengthened by batten plates was proposed,and the accuracy of the formula was verified.

关 键 词：缀板 冷弯薄壁型钢 受压性能 有限元方法 极限承载力 

分 类 号：TU391[建筑科学—结构工程]