32 m T型梁梁端变形对无砟轨道扣件受力规律研究  

Study on Effect of Deformations at the Ends of 32 m T-girder on Stress Distribution of Ballastless Track Fasteners

作　　者：付琪璋[1] 安震 李佳静 万廷聪 FU Qizhang;AN Zhen;LI Jiajing;WAN Tingcong(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China;China Railway Shenyang Bureau Group Co.,Ltd.,Shenyang 110001,China;Lunan High Speed Railway Co.,Ltd.,Jinan 250000,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]中国铁路沈阳局集团有限公司,沈阳110001 [3]鲁南高速铁路有限公司,济南250000

出　　处：《高速铁路技术》2024年第2期10-16,共7页High Speed Railway Technology

基　　金：陕西省重点研发计划项目(2022SF-452)。

摘　　要：无砟轨道扣件实现了钢轨与混凝土道床、下部基础的连接。扣件受力除轮轨作用下的正常服役工作状态外,还包括桥梁地段梁端变形诱发扣件受力状态变化。为保障桥梁地段无砟轨道扣件正常服役状态,本文以32 m T型梁为载体,通过分析梁端转角、垂向位移、预留梁缝及扣件安装位置等变量,研究了T型梁梁端变形及接口构造对无砟轨道扣件受力的影响。结果表明:梁端变形引起的扣件上拔力与梁端转角、垂向位移及转角位移组合变形线性相关,提出了不同构造变量与扣件上拔力的线性表达式。研究成果可为客货共线桥梁铺设无砟轨道梁端变形控制及构造设计提供参考。For ballastless track,fasteners are used to connect the steel rails with the concrete track bed and the underlying foundation.In addition to the load under the normal service conditions of wheel-rail interaction,the fasteners also encompasses stress variations due to deformation at the ends of girders in bridge sections.To ensure the normal service state of the ballastless track fasteners in bridge sections,this paper took 32 m T-girder as the example,to analyze variables such as rotation angle at girder end,vertical displacement,reserved girder gaps,and fastener installation position,and assess the impact of T-girder end deformations and joint structure on the force exerted on ballastless track fasteners.The results show that the uplift force on the fasteners caused by girder-end deformation is linearly related to the rotation angle at girder end,the vertical displacement,and the combined deformation of rotation and displacement.Linear expressions between different structural variables and the uplift force on the fasteners are proposed.The findings can provide a reference for controlling end deformations of T-girders and for the structural design in the construction of ballastless tracks on bridges of mixed passenger and freight railway.

关 键 词：无砟轨道 T型梁 梁端变形 扣件 上拔力 

分 类 号：U213.53[交通运输工程—道路与铁道工程]