高速铁路三线独塔斜拉桥设计研究  

Design and Research on Three-line Single Tower Cable Stayed Bridge of High-speed Railway

作　　者：余浪[1] 罗艳 YU Lang;LUO Yan(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]成都理工大学,成都610059

出　　处：《铁道标准设计》2021年第8期86-90,共5页Railway Standard Design

摘　　要：以某高速铁路三线大桥设计方案为工程依托,对主桥跨度、主梁形式及桥型方案进行研究,提出一种大跨双层钢-混结合钢桁梁独塔斜拉桥结构。根据双层钢-混结合钢桁梁独塔斜拉桥的结构特点,采用空间杆系有限元分析方法,对结构的纵向约束体系、辅助墩设置及钢桁梁断面形式进行分析,针对不同的设计方案分析对其力学行为的影响,确定最优方案。研究结果表明:双层钢-混结合钢桁梁独塔斜拉桥,可应用于高速铁路主跨300 m桥梁;结构采用纵向固定约束体系,可大幅减小主梁梁端位移,确保轨道结构的稳定性,提高结构行车安全;边跨设置辅助墩可提高主梁竖向刚度,减小梁端转角;钢桁梁采用倒梯形断面,双层钢-混结合桥面系,不设横联,是一种较合理的三线斜拉桥主梁断面形式。Based on the design scheme of a high-speed railway three-line bridge,the schemes of span,girder form and bridge type of the main bridge are studied,and a long span single-tower cable-stayed bridge of double-deck steel-concrete composite truss is proposed.According to the structural characteristics of single-tower cable-stayed bridge of double-deck steel-concrete composite truss,the longitudinal restraint system,the setting of auxiliary pier and the section form of steel truss are analyzed by using finite element analysis method of space bar system.The influences of different design schemes on its mechanical behavior are compared and the optimal scheme is determined.The results show that the single-tower cable-stayed bridge of double-deck steel-concrete composite truss can be applied to 300 m main span of high-speed railway.The longitudinal fixed restraint system can greatly reduce the displacement of girder end,ensure the stability of track structure and improve the service safety of the structure.The setting of auxiliary pier on side span can improve the vertical rigidity of main girder and reduce the angle of girder end.The steel truss beam adopts inverted trapezoid section and bridge deck system of double-deck steel-concrete without sway bracing,which is a reasonable section form of main girder of three-line cable-stayed bridge.

关 键 词：高速铁路 铁路桥 三线桥 独塔斜拉桥 双层钢桁梁 钢-混结合梁 设计研究 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]