华东交通大学学报2024，Vol.41Issue(2)：64-71,8.
地铁连续刚构桥上无砟轨道无缝线路纵向力分析
Longitudinal Force Analysis of Ballastless Track Continuous Welded Rail on Subway Continuous Rigid Frame Bridge
摘要
Abstract
[Objective]In order to study the longitudinal force and deformation law of CWR of ballastless track on the continuous rigid bridge of the metro,and to provide theoretical guidance for the design improvement,oper-ation and maintenance.[Method]Based on the principle of beam-plate-rail interaction,a spatial fine coupling model of CWR of the integral track bed type ballastless track on the continuous rigid bridge of the metro was es-tablished,and under stretching,bending,braking and broken rail conditions,the displacementtrack and longitudi-nal force of track structure and bridge were calculated,and the static characteristics of the track structure were compared and analyzed.This paper provides a reference for the design of CWR track structure on continuous rig-id bridge of metro.[Result]The results show that when the midpoint of the double-line train load coincides with the end of the middle beam,the vertical load of the train is the most unfavorable working condition,and the force of the rail and the displacement of the rail and bridge are the largest,and the values are 70.3 kN,0.6 mm and 0.8 mm,respectively.When the tail of the double-line brake load train is located at the end of the beams on both sides,the most unfavorable working condition of the train braking load,at this time,the longitudinal force of the rail and the longitudinal displacement of the rail and the bridge are the largest,and the values are 107.8 kN,1.6 mm and 1.7 mm,respectively.[Conclusion]Under expansion force,each end bridge joint is a weak part,and attention should be paid to the structure at the end bridge joint of the beam in the usual maintenance to prevent rail breakage due to excessive expansion force;When the rail is broken under cooling conditions,the longitudi-nal force and longitudinal displacement of the broken rail are abruptly changed at the fracture,which seriously af-fects the safety of the line.关键词
地铁连续刚构桥/整体道床/桥上无缝线路/纵向力Key words
metro continuous rigid bridge/integral track bed/continuous welded rail on the bridge/longitudinal force分类
交通工程引用本文复制引用
张鹏飞,江浩宇,胡达贵..地铁连续刚构桥上无砟轨道无缝线路纵向力分析[J].华东交通大学学报,2024,41(2):64-71,8.基金项目
国家自然科学基金项目(52178425,52368063) （52178425,52368063）
江西省科技专项(20223AEI91004) （20223AEI91004）
江西省高层次高技能领军人才培养工程项目(1600223003) （1600223003）
