钢板组合梁受压翼缘侧向扭转屈曲计算方法研究  

Research on Calculation Method of Lateral Torsional Buckling of the Lower Flange in Compression in Composite Girders

作　　者：李洁 李正 LI Jie;LI Zheng(China Design Group Co.,Ltd.,Nanjing 210014,China)

机构地区：[1]中设设计集团股份有限公司,南京210014

出　　处：《现代交通技术》2020年第3期37-41,54,共6页Modern Transportation Technology

摘　　要：钢板组合梁在中等跨径桥梁中的应用较多。连续钢板组合梁需要进行受压翼缘侧向扭转屈曲验算,我国钢混组合梁规范并未明确给出较为实用可行的计算方法。在参考欧洲规范的方法和思路的基础上,归类总结实用、简单的分析方法,即首先计算横向框架对主梁下翼缘的约束刚度,然后构建合适的压杆模型计算弹性屈曲放大系数,最后按照屈曲验算的一般准则进行判断。Composite girder is widely used in medium-span bridges.The lateral torsional buckling verification of the lower flange in compression is needed.The practical and feasible calculation methods are not clearly given in the specification of steel-concrete composite bridges in China.Based on the methods and ideas in Eurocodes,a practical and simple analysis method is summarized in this paper.The rigidity of bracing transverse frames linking to the lower flange is first calculated.Secondly a model with discrete inspan spring supports of stiffness is built with bar elements,and the critical load for lateral column buckling should be calculated.The lateral torsional buckling criterion is finally verified.

关 键 词：钢板组合梁 侧向扭转屈曲 计算方法 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]