长联大跨钢桁梁桥-无砟轨道静动力适应性研究
Research on Static and Dynamic Adaptability of Ballastless Tracks on Multi-long-span Steel Truss Bridge
朱志辉 1任增震 1郑纬奇 1余志武1
作者信息
摘要
研究目的:为研究高速铁路长联大跨钢桁梁桥铺设无砟轨道的适应性,本文以我国首座铺设无砟轨道的长联大跨钢桁梁桥-郑济高铁黄河特大桥为研究对象,基于梁轨相互作用原理建立钢桁梁桥-无砟轨道精细化非线性分析模型,分析无缝线路强度、变形协调性、轨道静态铺设精度指标的变化规律,研究钢桁梁桥-无砟轨道静力适应性;基于车桥耦合动力学理论建立车-轨-桥耦合动力学模型,分析不同温度下的车桥耦合振动及行车性能,研究钢桁梁桥-无砟轨道动力适应性.研究结论:(1)长联大跨钢桁梁桥-无砟轨道体系的无缝线路强度、变形协调性、轨道静态不平顺及行车性能指标等指标均满足规范要求,静动力适应性表现良好;(2)温度梯度对无砟轨道层间压缩量、扣件滑移量影响显著,与整体温差相比,分别增大了51.08%和50.00%;(3)温度梯度劣化轨道静态中短波不平顺,与整体温差相比,10 m弦长、30m基线长指标分别增大了144.12%和76.06%,60 m弦长指标基本不变;(4)温度梯度对轮重减载率影响显著,对脱轨系数、横向轮轨力等其他安全性和舒适度指标影响较小.
Abstract
Research purposes:In order to study the adaptability of ballastless tracks on multi-long-span steel truss bridge,taking the Zhengzhou-Jinan High-speed Railway Yellow River Bridge as the research object,based on the theory of track-bridge interaction and vehicle-bridge coupling vibration,the spatial refined finite element model of long-span steel truss bridge and ballastless track was established,and then the static and dynamic adaptability of ballastless tracks on long-span steel truss bridge was analyzed.Research conclusions:(1)The seamless line strength,deformation coordination,static track irregularity and traffic performance indexes meet the specification requirements,and the static-dynamic adaptability is good.(2)The temperature gradient has a significant effect on interlayer compression and sliding of fasteners,and the two indexes increase by 51.08%and 50.00%,respectively.(3)The temperature gradient degrades the track static irregularity,the value of 10 m chord and 30 m chord increase by 144.12%and 76.06%,respectively,while the 60 m chord remains basically unchanged.(4)The additional deformation has little effect on the vibration response,but it has significant effect on wheel load reduction rate.
关键词
高速铁路/长联大跨钢桁梁桥/无砟轨道/静力性能/动力响应/适应性Key words
high-speed railway/multi-long-span steel truss bridge/ballastless track/static property/dynamic response/adaptability引用本文复制引用
基金项目
国家自然科学基金(52078498)
湖南省自然科学基金(2022JJ40628)
湖南省自然科学基金(2022JJ30745)
湖南省教育厅科研项目(21A0010)
出版年
2024
NETL
NSTL
万方数据