连续梁桥边墩不均匀沉降下轨道层间变形协调关系及动力学应用  

DEFORMATION COMPATIBILITY RELATIONSHIP OF TRACK INTERLAYER WITH UNEVEN SETTLEMENT OF SIDE PIER OF CONTINUOUS GIRDER BRIDGE AND ITS DYNAMIC APPLICATION

作　　者：冯玉林 蒋丽忠[2,4] 陈梦成 周旺保[2,4] 刘祥 张云泰[2,4] FENG Yu-lin;JIANG Li-zhong;CHEN Meng-cheng;ZHOU Wang-bao;LIU Xiang;ZHANG Yun-tai(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering,Central South University,Changsha 410075,China;The State Local Joint Engineering Research Center for Security Technology of Operation Maintenance in Rail Transit Infrastructures,Nanchang 330013,China;National Engineering Laboratory for High Speed Railway Construction,Changsha 410075,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]中南大学土木工程学院,长沙410075 [3]轨道交通基础设施运维安全与保障技术国家地方联合工程研究中心,南昌330013 [4]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《工程力学》2021年第4期179-190,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51778630,51878275);高速铁路基础研究联合基金项目(U1934207);湖南创新型省份建设专项经费资助项目(2019RS3009);中南大学创新驱动项目(502501006);华东交通大学科研启动经费项目(2003420001)。

摘　　要：高速铁路连续梁桥边墩沉降将造成其上简支与连续梁桥的共同变形,边墩不均匀沉降差引起的轨道几何形位改变直接影响列车运行平稳性和安全性。该文基于APDL建立考虑引桥与路基及其上轨道结构影响的高速铁路CRTS II型无砟轨道-变截面连续梁桥系统精细化仿真模型,通过大量的仿真计算,探明了边墩不均匀沉降差与轨道几何形位改变的轨道层间变形协调机理。基于线性回归方法获得了不同连续梁桥跨度条件下,边墩不均匀沉降差与轨道几何形位改变的层间变形协调关系的定量函数表达式,进而采用该仿真模型、文献模型及列车-轨道-桥梁耦合动力学理论验证其拟合精度和正确性。最后基于定量函数表达式研究了边墩不均匀沉降差对列车运行平稳性和安全性的影响。结果表明:三种模型计算结果吻合良好,说明该文定量函数表达式具有较高精度;在边墩不均匀沉降工况下,存在激振频率接近车体自振频率的临界跨度,发生共振时,显著恶化列车运行平稳性;采用大跨度连续梁桥可有效降低边墩不均匀沉降差、提升乘坐舒适度、降低轮轨力及缓和列车与轨道动态作用效应;沉降差小于25 mm时,轮重减载率随跨度的增大而显著减小。The settlement of the side piers of high-speed railway continuous girder bridges will cause the compatible deformation of the upper simply supported and continuous girder bridges. The change of the trackgeometry caused by the uneven settlement of the side piers directly affects the running stability and safety of the train. Based on APDL, this paper establishes a refined simulation model of CRTS II type ballastless track continuous girder bridge system with variable cross-section considering the influence of the approach bridge and subgrade and the upper track structure. Through a large number of simulation calculations, the compatibility mechanism of track layer deformation between the uneven settlement difference of the side piers and the change of track geometry is explored. Based on the linear regression method, the quantitative function expression of the interlayer deformation compatibility relationship between the uneven settlement difference of the side pier and the change of the track geometry under different continuous girder bridge spans is obtained. Furthermore, the simulation model, literature model and the train-track-bridge coupling dynamics theory are used to verify its fitting accuracy and correctness. Finally, the influence of uneven settlement of side piers on the running stability and safety of the train is studied based on quantitative function expression. The research results show that the calculation results of the three models are in good agreement, which indicates that the quantitative function expression in this paper has a high accuracy. Under the condition of uneven settlement of side piers, there exists a critical span where the excitation frequency is close to the natural frequency of the vehicle body. When resonance occurs, the train running stability will be significantly affected. Adopting the long-span continuous girder bridge can effectively reduce the uneven settlement difference of side piers, improve riding comfort, reduce wheel-rail force and alleviate the dynamic effect of t

关 键 词：高速铁路 不均匀沉降 车桥耦合动力学 层间变形协调关系 线性回归方法 

分 类 号：U213.2[交通运输工程—道路与铁道工程]