摘要
路桥过渡段不均匀沉降对高速车辆的行车安全性及舒适度影响较大.本文研究了路桥过渡段不均匀沉降与钢轨变形的映射关系,并将其应用于分析高速动车通过该区域时的动力学特性.首先,分析了路桥过渡段不均匀沉降引起钢轨变形的机理.然后,建立了铺设有CRTS-Ⅲ型板式轨道的路桥过渡段有限元模型,通过大量计算,分析了高速铁路路桥过渡段不均匀沉降与钢轨变形的映射关系.在此基础上,基于最小二乘多项式拟合原理,得到该映射关系的函数表达.最后,基于车辆-轨道耦合动力学理论,分析了高速动车以不同方向通过路桥过渡段的动力学性能.研究结果表明:路桥过渡段发生不均匀沉降后的钢轨变形可通过函数式进行描述.轮轨垂向力随着过渡段不均匀沉降差的增加变化不明显,车体垂向加速度随着过渡段沉降差的增加而增大.动力学分析结果可为高速铁路路桥过渡段的施工与养护维修提供技术参考.
The uneven settlement of subgrade-bridge transition section has a great influence on the driving safety and comfort of high-speed vehicles. This paper studies the mapping relationship between uneven settlement of subgrade and rail deformation in this section and it has been used to analyze the dynamic characteristics of the high-speed train when it is passing through the transition section. After the mechanism analysis of rail deformation, the subgrade-bridge transition section with CRTS-Ⅲ slab ballastless track is built by finite element method（FEM）. Mapping relationship between uneven settlement of subgrade and rail deformation can be obtained by large amounts of calculation. Based on the rail deformation curves from FEM model, the functional expression of the mapping relationship is given using least squares polynomial method. Finally, based on train-track coupled dynamics, the dynamic behaviors of the high speed train are analyzed on different conditions. The results show that there is a mapping relationship between settlement of subgrade and rail deformation, which can be given by a function. The function can describe the rail deformation accurately and reliably in transition section. The uneven settlement amplitude will not influence the wheel and rail force. However, the acceleration of carbody will increase with greater amplitude of settlement. The results of this paper can be the reference to the construction and maintenance of subgrade-bridge transition section.
作者
何春燕
陈兆玮
翟婉明
HE ChunYan;CHEN ZhaoWei;ZHAI WanMing(State Key Laboratory of Traction Power,Southwest Jiaotong Univercity,Chengdu 610031,China)
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2018年第8期881-890,共10页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:11790283
51678507)
国家重点基础研究发展计划(编号:2013CB036206)
高等学校学科创新111引智计划(编号:B16041)资助项目
关键词
高速铁路
路桥过渡段
映射关系
耦合动力学
CRTS-Ⅲ型板式无砟轨道
high-speed railway
subgrade-bridge transition section
mapping relationship
coupled dynamics
CRTS-III slabballastless track
