摘要
为探究桥墩沉降引起的轨道结构变形及其对磁浮车辆行车安全及舒适性的影响规律,基于有限元方法建立考虑轨道结构层间相互作用的桥墩沉降区段四跨简支梁高架轨道精细化分析模型,研究桥墩沉降幅值、波长(不同桥梁跨度)和环境因素对沉降区段F轨结构的变形影响规律;并基于有限元-多体系统动力学方法(FEM-MBD),在考虑空间磁轨关系的基础上,建立中低速磁浮车辆-轨道-桥梁耦合系统非线性动力学模型,分析中低速磁浮车辆通过桥墩沉降区段时的动力响应。结果表明:F轨垂向最大变形量随沉降幅值的增加而增大,且20 m跨度桥梁受桥墩沉降影响最大;当桥墩沉降量达到15 mm时,20 m跨度桥梁的F轨轨面10 m弦矢高值已超过规范限值,而25 m和30 m跨度桥梁的F轨轨面几何精度在沉降量达到20 mm时超过限值;进一步考虑温度及轨道自重因素时,桥墩沉降区段F轨轨面几何精度将进一步恶化,25 m和30 m跨度桥梁的F轨轨面几何精度在桥墩沉降10 mm时就已经超过规范限值。车辆通过桥墩沉降区段时,车体垂向加速度对车速变化更敏感,且随着车速的增加显著增大;仅考虑沉降作用时,车体垂向加速度随着跨度的增加先减小后增大,而考虑温度及轨道自重作用时,车体垂向加速度随着跨度的增加而增大;当桥墩沉降量达到15 mm时,车辆通过30 m跨度桥梁时,车体垂向加速度超过舒适度限值,应适当降低运行速度以保证行车安全以及舒适性要求。研究结论以期为沉降区段中低速磁浮车辆安全运营及磁浮轨道建设提供参考。
In order to investigate the deformation of the track structure caused by the settlement of the bridge abutment and its influence on the safety and comfort of the maglev vehicle,a four-span simply supported girder elevated track refinement analysis model was established based on the finite element method(FEM),considering the interaction between the layers of the track structure in the section of the bridge abutment settlement.The goal was to study the magnitude of the settlement of the abutment,the wavelength(of the different bridge spans)and the deformation of environmental factors on the deformation of the F-rail structure in the section of settlement.Furthermore,a nonlinear dynamics model of medium-low speed maglev vehicle-track-bridge coupling system was established based on the FEM-multibody system dynamics(FEM-MBD)method,considering the spatial magnetic track relationship.The results show that:the maximum vertical deformation of F-rail increases with the increase of settlement amplitude,and the 20 m-span bridge is most affected by the settlement of the bridge abutment;when the settlement of the bridge abutment reaches 15 mm,the 10 m chord vectors of the F-rail surface of the 20 m-span bridge have exceeded the normative limit,and the geometric accuracy of the F-rail surface of the 25 m-and 30 m-span bridges has exceeded the limit when the settlement reaches 20 mm;when the temperature and track self-weight factors are further considered,the bridge temperature and track self-weight are more than the normative limit.The track weight factors,abutment settlement section F rail surface geometric accuracy will further deteriorate,25 m,30 m span bridge F rail surface geometric accuracy in the abutment settlement 10 mm has exceeded the specification limit.Vehicle through the abutment settlement section when the car body vertical acceleration is more sensitive to changes in speed with the increase in speed significantly increased;only consider the role of settlement when the car body vertical acceleration with the increase in span first decreased after the increase,and consider the role of temperature and rail track weight when the car body vertical acceleration with the increase in span;when the abutment settlement amount reaches 15 mm,the vehicle through the 30 m-span bridge body vertical acceleration exceeds the comfort limit.When the settlement of the bridge abutment reaches 15 mm,the vehicle body vertical acceleration exceeds the comfort limit,and the running speed should be reduced to ensure the safety and comfort requirements.The conclusion of the study is intended to provide reference for the safe operation of low-speed magnetic levitation vehicles and the construction of magnetic levitation tracks in the settlement area.
作者
丁旺才
张延永
张修璐
杜健
史新生
田建文
李国芳
DING Wangcai;ZHANG Yanyong;ZHANG Xiulu;DU Jian;SHI Xinsheng;TIAN Jianwen;LI Guofang(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Mechanical and Electrical Engineering,Xi’an Traffic Engineering Institute,Xi’an 710300,China;National Key Laboratory of High-Speed Magnetic Levitation Transportation Technology of CSR Qingdao Sifang Locomotive and Rolling Stock Co.,Ltd.,Qingdao 266000,China;School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《铁道科学与工程学报》
北大核心
2025年第6期2743-2757,共15页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(12262017,12162020)
高速磁浮运载技术全国重点实验室开放基金资助项目(SKLM-SFCF-2024-005)
甘肃省联合科研基金一般项目(24JRRA854)
兰州交通大学重点研发项目(ZDYF2302)。
关键词
中低速磁浮
磁轨关系
桥墩沉降
轨道变形
车辆动力响应
low-medium speed maglev transport
magnet-track relationship
bridge pier settlement
rail deformation
vehicle power response
