横向约束槽钢截面柱畸变屈曲分析  

Analysis of distortion buckling of channel section columns with lateral restraint

作　　者：吴梦景 李佰树 朱珏[1,2] Wu Mengjing;Li Baishu;Zhu Jue(Key Laboratory of Impact and Safety Engineering,Faculty of Mechanical Engineering and Mechanics,Ningbo University,315000,Ningbo,China;Joint Research Institue of Ningbo University and Ningbo Special Equipment Inspection Institute,315000,Ningbo,China)

机构地区：[1]宁波大学机械工程与力学学院冲击与安全工程教育部重点实验室,宁波315000 [2]宁波大学-宁波特检院联合研究院,宁波315000

出　　处：《应用力学学报》2020年第2期589-594,I0008,I0009,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11972203,11572162);浙江省自然科学基金(LY13A020007);第47批国家教育部留学回国人员基金;宁波大学王宽诚基金。

摘　　要：提出了用于计算冷弯薄壁槽钢柱畸变屈曲临界应力的加劲板模型。在加劲板模型中,腹板视为板单元,而翼缘和卷边则假设为在腹板两端施加的角加劲肋,因此槽钢截面构件可视为腹板(板)与翼缘-卷边(角加劲)组成的加劲板。通过加劲板模型,可以考虑腹板与翼缘-卷边之间相互约束效应,并基于最小势能原理,推导出构件畸变屈曲临界应力计算公式。为了验证加劲板模型的正确性,以槽钢柱为例,对选用的构件进行畸变屈曲临界应力计算,并与有限条程序计算结果进行比较,平均误差为4.0%,从而验证了本文模型的正确性。In the current work,a stiffening plate buckling model is presented for studying the distortional buckling behavior of cold-formed steel channel section column with vertical restraint on the web-flange joint.In the presented model,the web is modeled as a plate element,while the top and bottom flange-lip are assumed to be angle stiffener.Therefore,the channel section can be modeled as the web(plate)and the flange-lip named stiffeningplate.In addition,the restraining effect of the web on the flange-lip can be considered.Using the total potential energy principle,the formula for calculating the distortional buckling stress of CFS channel section column with vertical restraint on the web-flange joint are derived.Finally,the calculation of distortional bucking critical stress of CFS channel section column is carried out,which is shown to be good agreement with those predicted by finite strip method(FSM).The average deviation is within 4%.

关 键 词：冷弯薄壁槽钢 畸变屈曲 加劲板模型 解析解 

分 类 号：TU392.1[建筑科学—结构工程]