目形钢箱拱肋截面承载力计算方法  

Bearing Capacity Calculation Method of Three-cells Steel Box Section in Arch Rib

作　　者：钱栋栋 陈潮 齐士乐 曹树森 那明望 吴庆雄[3] QIAN Dongdong;CHEN Chao;QI Shile;CAO Shusen;NA Mingwang;WU Qingxiong(Taizhou Taizhong Rail Transit Co.,Ltd.,Taizhou,Zhejiang 318014,China;CRRC Intelligent Transportation Engineering Technology Co.,Ltd.,Beijing 100078,China;College o Civil Engineering,Fuzhou University,Fuzhou,Fujian 350116,China)

机构地区：[1]台州台中轨道交通有限公司,浙江台州318014 [2]中车智能交通工程技术有限公司,北京100078 [3]福州大学土木工程学院,福建福州350116

出　　处：《水利与建筑工程学报》2023年第4期192-200,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(52078137)。

摘　　要：以某大桥主副拱结合处的目字形截面为研究对象,采用有限元软件ABAQUS建立目形截面钢箱拱肋局部计算模型,进行目形截面承载力和截面屈曲变形研究,并分析了钢箱高度比、中板厚度及加劲肋数量变化对截面承载力的影响。结果表明:目形截面靠近角点处的变形大于板件中间部分的变形,靠近角点处的加劲肋设计是目形截面设计关键;目形截面的承载力折减系数受中板板厚及中板纵向加劲肋划分中板份数的影响较大;我国规范和日本规范不适用于目形截面承载力折减系数计算;根据参数分析结果进行拟合,提出了适用于计算考虑局部屈曲的目形钢箱截面承载力折减系数的计算公式。In this paper,taking the mesh section at the junction of the main and auxiliary arches of Gongwang bridge as the research object,the local calculation model of the mesh section steel box arch rib is established by using the finite element software ABAQUS,the bearing capacity and section buckling deformation of the mesh section are studied,and the effects of the height ratio of the steel box,the thickness of the middle plate and the number of stiffeners on the section strength are analyzed.The results show that the deformation of the mesh section near the corner is greater than that of the middle part of the plate,and the design of the stiffener near the corner is the key to the design of the mesh section.The strength reduction coefficient of the mesh section is greatly affected by the thickness of the middle plate and the number of middle plates divided by the longitudinal stiffeners of the middle plate.Chinese and Japanese codes are not applicable to the calculation of strength reduction coefficient of eye shaped section;According to the fitting of the parameter analysis results,a calculation formula suitable for calculating the strength reduction coefficient of mesh steel box section considering local buckling is proposed.

关 键 词：桥梁工程 目形截面 钢箱拱肋 承载力折减系数 局部屈曲 

分 类 号：U441[建筑科学—桥梁与隧道工程]