齿轨铁路轨道-简支梁桥相互作用及轨缝合理位置研究  

RESEARCH ON SIMPLY SUPPORTED BEAM-TRACK INTERACTION AND REASONABLE GAP POSITION OF RACK RAILWAY

作　　者：张乾 蔡小培[1] 蔡向辉[2] 张岷[2] ZHANG Qian;CAI Xiao-pei;CAI Xiang-hui;ZHANG Min(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Track and Transportation Department,China Railway First Survey and Design Institue Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中铁第一勘察设计院集团有限公司线路运输处,西安710043

出　　处：《工程力学》2021年第3期248-256,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51778050);中国铁路总公司科技研究开发计划项目(2017G010-A);中央高校基本业务科研费项目(2018JBZ003)。

摘　　要：齿轨铁路与桥梁的梁轨相互作用对行车安全和结构稳定均有重要影响。基于有限元理论,建立了齿轨(钢轨)-轨枕-桥梁-墩台空间耦合计算模型,分析了典型荷载作用下齿轨铁路轨道-简支梁桥相互作用。结果表明:简支梁桥上齿轨铁路梁轨相互作用强于常规桥上无缝线路,在列车纵向荷载作用下的钢轨纵向力、梁轨相对位移、墩顶纵向力、墩顶纵向位移等指标比常规桥上无缝线路大40%以上,建议增强轨道基础与梁体的约束作用,增大轨道结构纵向阻力,防止在列车纵向荷载作用下的轨道爬行。齿轨最大等效应力小于其容许应力,齿轨强度不是结构设计的控制指标。建议齿轨轨缝与梁缝错开布置,可有效避免齿轨轨缝变化过大。The beam-track interaction of rack railway on a simply supported beam bridge has an important impact on vehicle safety and structural stability. Based on the finite element theory, a space-coupling calculation model for the rack(rail)-sleeper-beam-pier is established. The beam-rail interaction of rack railway on a simply supported beam bridge under different loads is analyzed. The results show that the beam-track interaction of rack railway on a simply supported beam bridge is stronger than that of a continuous welded rail(CWR) on bridge.Under the longitudinal train load, the rail force, beam rail relative displacement, longitudinal force and displacement of pier top are 40% larger than those of the CWR on bridge. It is recommended to strengthen the restraint between track foundation and beam to increase the longitudinal resistance and prevent the crawling of the track under longitudinal force. The maximum stress of rack is less than its allowable stress so that the rack strength is not used as a control factor for structural design. It is recommended that the position of rack gap be staggered from the beam gap to effectively prevent the rack gap from changing too much.

关 键 词：铁道工程 齿轨铁路 简支梁桥 有限元理论 梁轨相互作用 轨缝 

分 类 号：U234[交通运输工程—道路与铁道工程]