超大跨度协作体系桥上轨道几何状态分析  

Geometrical State Analysis of Track on Super Large Span Cooperative System Bridge

作　　者：庄丽媛 肖杰灵 何东升[3] 王平[1,2] ZHUANG Liyuan;XIAO Jieling;HE Dongsheng;WANG Ping(Key Laboratory of High Speed Railway Engineering,Ministry of Education,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031 [3]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《铁道标准设计》2022年第9期15-21,共7页Railway Standard Design

基　　金：中铁大桥勘测设计院集团有限公司科技开发计划项目(R110120H01098)。

摘　　要：为分析评估超大跨度斜拉-悬索协作体系桥上线路空间线形和轨道几何形位特征,以某超大跨度协作体系跨海大桥为例,通过数值分析从线形参数、虚拟中点弦测和列车动力学评价等角度对桥上轨道几何状态进行分析。研究结论如下:(1)对设计状态各工况下的梁面变形进行拟合和线路参数分析,均满足相关规范要求,且温度变化引起的桥梁竖向位移较为显著,整体降温工况下跨中轨面高程增加,跨中纵断面竖曲线曲率增加;(2)40 m中点弦测法计算得到轨向弦测幅值较小,高低最大弦测幅值为21.93 mm,对应垂向加速度为0.199g,仍留有一定的安全余量;(3)列车行为动力学评估得到未被平衡离心加速度满足舒适度控制标准及相关规范,且离心加速度最大值主要集中在边跨桥墩附近,同时,桥塔附近也存在离心加速度极大值,运维部门需关注;(4)需加强轨道不平顺对列车运行的影响研究,提出适合高速铁路大跨度桥梁的轨道静态平顺性能控制指标。For the analysis and evaluation of line space shape and track geometry of large span suspension-cable cooperation system bridge,the track geometry on bridge is analyzed by means of numerical analysis,virtual midpoint chord measurement and evaluation of train dynamics with reference to a large span bridge.The research conclusions are as follows:(1)The beam surface deformation under the design condition is fitted and line parameters are analyzed,which meet the relevant requirements,and the vertical displacement of the bridge caused by temperature change is prominent.Under the overall cooling condition,the elevation of the mid-span rail surface increases,and the curvature of the vertical curve of the mid-span longitudinal section increases;(2)The measured amplitude of the orbital chord is small,the maximum measured amplitude of the high and low chord is 21.93 mm,and the corresponding vertical acceleration is 0.199g,which still leaves a certain margin of safety;(3)The evaluation of train behavior dynamics shows that the unbalanced centrifugal acceleration meets the comfort control standard and relevant specifications,and the maximum value of centrifugal acceleration is mainly concentrated near the side span piers.Meanwhile,the maximum value of centrifugal acceleration also exists near the bridge tower,which requires the attention of the operation and maintenance departments;(4)It is necessary to strengthen the research on the influence of track irregularity on train operation,and put forward the control index of static track smoothness suitable for high-speed railway long-span bridge.

关 键 词：超大跨度桥梁 几何不平顺 竖曲线评价法 40 m弦测法 列车动力学评估 

分 类 号：U213.2[交通运输工程—道路与铁道工程] U441.7[建筑科学—桥梁与隧道工程]