摘要
针对刚构桥上无砟轨道无缝线路的受力与变形进行研究,以梁-板-轨相互作用原理为基础,分别建立刚构桥上CRTSⅢ型板式和CRTSⅠ型双块式无砟轨道无缝线路空间耦合模型,计算伸缩、挠曲、制动、断轨工况下轨道结构和桥梁纵向力及位移,并对两种轨道结构静力特性进行对比分析,为刚构桥上无缝线路轨道结构设计提供参考。结果显示:在温度荷载、列车荷载作用下,采用CRTSⅠ型双块式轨道结构时钢轨纵向力更小,但轨板相对位移增幅明显,可能产生安全隐患;在列车制动荷载工况下,采用CRTSⅢ型板式轨道结构时钢轨纵向力与轨板相对位移均更小;在断轨工况下,采用CRTSⅠ型双块式轨道结构时断缝值超过了规范容许限值。建议在刚构桥上采用CRTSⅢ型板式无砟轨道。
To study the stress and deformation of ballastless track CWR on rigid frame bridge,based on the principle of beam-slab-rail interaction,the models of CRTSⅢslab track and CRTSⅠbi-block track jointless track on rigid frame bridge were established respectively.The longitudinal forces and displacements of each structure under the conditions of expansion,deflection,braking and rail breaking were calculated,and the static characteristics of two kinds of ballastless track structures were compared and analyzed,so as to provide consultation for the track structural design of CWR on rigid frame bridge.The results show that under temperature load and train load conditions the rail longitudinal force of CRTSI bi-block track CWR on rigid frame bridge is smaller,but the relative displacement of rail and track slab increases significantly,which may lead to potential safety hazards;Under the train braking load condition,the longitudinal stress of the rail and the relative displacement of the rail slab of CRTSⅢslab track CWR on the rigid frame bridge are smaller;Under the broken track condition,the broken joint value of CRTSI bi-block track CWR on rigid frame bridge exceeds the allowable limit of the specification.Accordingly,CRTSIII slab track is recommended for rigid frame bridge.
作者
张鹏飞
黄安琪
胡达贵
陈华鹏
Zhang Pengfei;Huang Anqi;Hu Dagui;Chen Huapeng(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;School of Architectural Engineering,Fujian Vocational&Technical College of Water Conservancy&Electric Power,Yong’an 366000,China)
出处
《华东交通大学学报》
2023年第2期30-38,共9页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(52178425)
国家重点研发计划项目(2021YFE0105600)。
