摘要
为研究高速铁路千米级桥有砟轨道线路力学与变形特征,基于梁-轨相互作用原理,建立了无缝线路-有砟轨道-千米级跨度桥梁空间耦合模型。分析了悬索桥构件温差对线路受力变形规律的影响,提出了线路的垂向变形特征,并采用中点弦测法和基线矢距差法评估了线路平顺性。结果表明:在主梁梁端铺设伸缩调节器可以确保桥上轨道强度和稳定性满足规范要求;悬索桥主梁和主缆的温差是影响无缝线路纵向力的主要因素,吊杆与桥塔的温度变化对线路的影响极小;影响悬索桥上线路垂向变形的主要因素依次为主缆温差、桥塔温差、吊杆温差和主梁温差,线路变形敏感区域集中在主桥跨中和主塔区域;温度作用下线路高低不平顺集中在桥墩、桥塔和桥梁跨中区域。该成果可为千米级悬索桥上无缝线路设计及运维提供借鉴。
To study the mechanical properties and deformation characteristics of the ballast track on kilometer-span bridges of continuous welded rail(CWR)in high-speed railways,a spatial coupling model of the CWR-ballast track-kilometer span bridge was established based on the principle of the beam-rail interaction.The influence of temperature difference in structural components of the suspension bridge on the longitudinal force and deformation law of CWR was analyzed,and the vertical deformation characteristics of CWR were proposed.Furthermore,the regularity of CWR on the bridge was evaluated using the midpoint chord measurement,and the baseline length measurement.Results show that it is crucial to install rail expansion joints(REJ)at the main beam's end to ensure the strength and stability of the track on the bridge meeting the requirements of the specifications.The temperature differences between the main beam and the main cable of the suspension bridge component are the main factors affecting the longitudinal force of CWR,with the suspenders and the bridge towers having minimal impact.The primary factors affecting the alignment of the track on the suspension bridge are the temperature difference of the main cable,the bridge tower,the suspenders,and the main beam,with the sensitive areas of track deformation mainly concentrated in the mid-span area of the main bridge and the main tower area.Under temperature effects,the high and low unevenness on the suspension bridge is mainly concentrated in the bridge piers,bridge towers,and mid-span areas of the bridge.The research findings serve as valuable references for designing,operating,and maintaining CWR on kilometer-span suspension bridges.
作者
蔡小培
杨憬帆
刘万里
牛留斌
CAI Xiaopei;YANG Jingfan;LIU Wanli;NIU Liubin(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Infrastructure Inspection Research Institute,China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China)
出处
《北京工业大学学报》
北大核心
2025年第9期1102-1110,共9页
Journal of Beijing University of Technology
基金
国家重点研发计划资助项目(2022YFB2602900)
中央高校基本科研业务费专项资助项目(2022JBCZ007)
中国国家铁路集团有限公司科技研究开发计划项目资助(J2022G004)。
关键词
千米级主跨桥梁
有砟轨道
梁-轨相互作用
钢轨纵向力
静态平顺性
无缝线路
kilometer-span bridge
ballast track
beam-rail interaction
rail longitudinal force
static regularity
continuous welded rail
