多桥墩沉降下轨道底座板与桥面板间脱空区域的研究分析  

Research and Analysis of the Void Area between Base Plate and Bridge Plate under the Settlement of Multiple Pier

作　　者：陈天浩 杨建伟 王金海[1,2] 金京 CHEN Tianhao;YANG Jianwei;WANG Jinhai;JIN Jing(School of Mechanical-Electronic and Vehicle Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044;Beijing Key Laborator for Performance Guarantee of Urban Rail Transit Vehicles, Beijing University of Civil Engineering and Architecture, Beijing 100044)

机构地区：[1]北京建筑大学机电与车辆工程学院,北京100044 [2]北京建筑大学城市轨道交通车辆服役性能保障北京市重点实验室,北京100044

出　　处：《北京建筑大学学报》2021年第2期54-62,共9页Journal of Beijing University of Civil Engineering and Architecture

基　　金：国家自然科学基金面上项目(51975038);北京市自然科学基金重点项目(KZ202010016025)。

摘　　要：分析了桥梁上纵连板式轨道结构下底座板随桥墩沉降产生脱空区域的机理。在此基础上,推导了纵连板式轨道结构下桥墩沉降与底座板脱空区域间映射关系的解析表达式,计算了底座板随桥墩沉降的位移曲线,并与有限元模型结果进行对比,最后在单墩沉降、相邻两墩沉降和相邻三墩沉降3种工况下,对不同沉降量产生的脱空区域范围和间距值进行对比分析。结果表明:解析模型可用于求解纵连板式轨道结构下底座板由于桥墩沉降产生的脱空问题;单墩沉降下底座板脱空区域范围和脱空最大间距随沉降量的增加而增加;在相邻两墩和三墩沉降工况中,脱空区域间距值与桥墩沉降处相邻的两跨梁夹角有关,且某一桥墩的沉降值产生变化,只会对相邻桥墩的脱空区域间距值产生影响。The mechanism of the void area of the base slab along with pier settlement in the longitudinal connected ballastless track system is analyzed.On this basis,the analytic expression of the mapping relationship between pier settlement and the void area of the base plate in the longitudinal connected ballastless track system is deduced.The base plate deformation curve is calculated and compared with the finite element model results.Finally,under three different working conditions:settlement of single pier,settlement of two adjacent piers and settlement of three piers,a comparative analysis of the size and spacing of void areas caused by different settlement values is carried out.The results show that the analytical model can be used to solve the void problem due to the pier settlement in the longitudinal connected ballastless track system.The void areas and the maximum gap distance of the base plate increase with the increase of the settlement under the settlement of single pier.In the settlement conditions of two adjacent piers and three piers,the spacing is related to the angle between the adjacent two-span beams at the settlement of the pier.The settlement value’s change of a certain pier will only affect the spacing between adjacent piers.

关 键 词：铁路桥梁 映射关系 数值计算 脱空区域 桥墩沉降 

分 类 号：U213.2+1[交通运输工程—道路与铁道工程]