快速地铁系统中轨道过渡区域弹条动力学研究
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摘要
为了研究快速地铁线路中不同轨道过渡区域扣件弹条的力学行为变化,基于车辆-轨道耦合动力学理论和多体动力学理论,建立地铁车辆-轨道过渡段动力学模型,探究地铁车辆快速通过时的弹条动位移。基于有限元理论,构建e型弹条三维实体有限元模型,将弹条动位移作为边界条件施加于该有限元模型,研究轨道过渡区域弹条在地铁快速运行状态下的应力变化规律,并在此基础上提出钢轨位移差的控制限值。结果表明:当地铁列车以120 km/h的速度通过轨道过渡区域时,浮置板轨道侧的弹条动位移要大于整体道床侧;弹条动应力最大位置发生在弹条后拱内侧;建议快速地铁轨道过渡区域的钢轨位移差应小于1. 6 mm,以保证弹条的正常使用和地铁列车的安全运营。
In order to study the change of the mechanical behavior of the elastic bars in different transitional sections in the fast-metro system (FMS),a dynamic model of the transitional section of the metro vehicle-track was established to explore the dynamic based on the theory of vehicle-track coupling dynamics and multi-body dynamics theory displacement of the elastic bars when the metro vehicles was passing quickly three-dimensional solid finite element model of the e-type bar was constructed based on the finite element theory,and the dynamic displacement of the bar was applied to this model as a boundary condition to study the stress variation law of the elastic bar in the rail transit region under the condition of fast running metro,and the control limit of rail displacement difference was put forward on this basis. Results showed that,when the vehicle running through the track transition section at a speed of 120 km/h,the dynamic displacement of elastic bar on the floating slab track side was larger than that of the monolithic roadbed track. The maximum dynamic stress of the elastic bar occurred at the rear arch of it. It was suggested that the rail displacement difference in the transition section of the rapid metro track should be less than 1. 6 mm to ensure the normal use of the elastic bar and the safe operation of the metro train.
In order to study the change of the mechanical behavior of the elastic bars in different transitional sections in the fast-metro system (FMS),a dynamic model of the transitional section of the metro vehicle-track was established to explore the dynamic based on the theory of vehicle-track coupling dynamics and multi-body dynamics theory displacement of the elastic bars when the metro vehicles was passing quickly three-dimensional solid finite element model of the e-type bar was constructed based on the finite element theory,and the dynamic displacement of the bar was applied to this model as a boundary condition to study the stress variation law of the elastic bar in the rail transit region under the condition of fast running metro,and the control limit of rail displacement difference was put forward on this basis. Results showed that,when the vehicle running through the track transition section at a speed of 120 km/h,the dynamic displacement of elastic bar on the floating slab track side was larger than that of the monolithic roadbed track. The maximum dynamic stress of the elastic bar occurred at the rear arch of it. It was suggested that the rail displacement difference in the transition section of the rapid metro track should be less than 1. 6 mm to ensure the normal use of the elastic bar and the safe operation of the metro train.
引文
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[2]全顺喜,王平,陈嵘.钢桁梁梁端横向伸缩对轨道几何形位的影响[J].重庆交通大学学报(自然科学版),2010,29(6):859-861.QUAN S X,WANG P,CHEN R.Impact of beam-end lateral expansion of steel truss girder on geometrical shape of track[J].Journal of Chongqing Jiaotong University(Natural Science),2010,29(6):859-861.
[3]雷晓燕,张斌,刘庆杰.轨道过渡段动力特性的有限元分析[J].中国铁道科学,2009,30(5):15-21.LEI X Y,ZHANG B,LIU Q J.Finite element analysis on the dynamic characteristics of the track transition[J].China Railway Science,2009,30(5):15-21.
[4]蔡成标,刘增杰,赵汝康.浮置板轨道过渡段的动力学设计[J].铁道建筑,2003(12):41-44.CAI C B,LIU Z J,ZHAO R R.Dynamic design of track transition of floating slab track[J].Railway Engineering,2003(12):41-44.
[5]邹锦华,王荣辉,魏德敏.橡胶浮置板无砟轨道过渡段动力学性能分析[J].铁道建筑,2010(3):82-85.ZOU J H,WANG R H,WEI D M.Dynamic performance of floating slab track at transition section[J].Railway Engineering,2010(3):82-85.
[6]江万红,任娟娟,解鹏,等.梯形轨道-普通整体道床过渡段布置方式研究[J].铁道标准设计,2015,59(5):74-77.JIANG W H,REN J J,XIE P,et al.Study on setting-up of transition section between ladder track and monolithic roadbed[J].Railway Standard Design,2015,59(5):74-77.
[7]翟婉明.车辆-轨道耦合动力学[M].3版.北京:科学出版社,2007.ZHAI W M.Vehicle-track coupled dynamic(3 rd edition)[M].Beijing:Science Press,2007.
[8]CHEN Z,ZHAI W,YIN Q.Analysis of structural stresses of tracks and vehicle dynamic responses in traintrack-bridge system with pier settlement[J].Proceedings of the Institution of Mechanical Engineers,Part F:Journal of Rail and Rapid Transit,2018,232(2):421-434.
[9]陈兆玮,孙宇,翟婉明.高速铁路桥墩沉降与钢轨变形的映射关系(Ⅰ):单元板式无砟轨道系统[J].中国科学:技术科学,2014,44(7):770-777.CHEN Z W,SUN Y M,ZHAI W.Mapping relationship between pier settlement and rail deformation of highspeed railways-Part I:the case of unit slab track system[J].Scientia Sinica:Technologica,2014,44(7):770-777.
[10]CHEN Z W,ZHAI W M,CAI C B,et al.Safety threshold of high-speed railway pier settlement based on train-track-bridge dynamic interaction[J].Science China-Technological Sciences,2015,58(2):202-210.