摘要
在轨道交通实际运营过程中,由于无缝线路不能自由伸缩,无缝线路中的钢轨存在着一定的轴向温度力的作用。建立了考虑钢轨轴向温度力的无砟轨道连续弹性三层梁模型的振动微分方程,求解傅里叶变换域中的振动位移,通过快速离散傅里叶逆变换得到轨道结构的振动位移。利用MATLAB软件编制相应的程序,分析了钢轨轴向温度力对无砟轨道振动响应的影响。研究结果表明:钢轨轴向温度力越大,轨道结构的振动响应越小;当轨温变化升高50℃时,轨道结构的位移和动压力都将减小约5%~10%。说明钢轨承受适当的轴向温度压力对轨道结构的减振是有利的,该结论可为无砟轨道结构设计和运营管理提供参考。
In the actual operation of rail transit,a certain axial temperature force exists in the rails because the continuous welded rail is not retractable.In this paper,the vibration differential equation for three-layer continuous elastic beam model of ballastless track is established,in which the axial temperature force is taken into account.Then,the vibration differential equation is transformed by fast discrete Fourier transform and the vibration displacement in Fourier transform domain is solved with this transformed equation.The corresponding program is programmed by MATLAB,and the influence of rail axial temperature force on the vibration response of ballastless track is analyzed.The results show that the greater the axial temperature force of the rail,the lower the vibration response of the track structure will be.When the rail temperature increases 50℃,the displacement and dynamic pressure of the track structure will decrease about 5%~10%.It is beneficial for the vibration reduction of track structure when the rail is subjected to an appropriate axial temperature pressure.This research provides reference for ballastless track structure design and operation management.
作者
宋瑞
刘林芽
秦佳良
SONG Rui;LIU Linya;QIN Jialiang(School of Civil Engineering and Architecture,Nanchang Institute of Technology,330029,Nanchang,China;不详)
出处
《城市轨道交通研究》
北大核心
2019年第12期26-29,共4页
Urban Mass Transit
基金
江西省教育厅科技项目(GJJ170984)
国家自然科学基金项目(51578238,51608201)
江西省优势科技创新团队项目(20152BCB24007)
关键词
无砟轨道
无缝线路
钢轨轴向温度力
轨道振动
傅里叶变换
ballastless track
continuous welded rail
rail axial temperature force
track vibration
Fourier transform
