侧风下大跨拱桥变形对高速列车行车平稳性的影响机理  

Influence Mechanism of Long-Span Arch Bridge Deformation on Running Stability of High-Speed Trains Under Crosswind

作　　者：李小珍[1,2] 周彦希 王铭[1,2] LI Xiaozhen;ZHOU Yanxi;WANG Ming(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学桥梁智能与绿色建造全国重点实验室,四川成都611756

出　　处：《西南交通大学学报》2025年第1期1-9,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(52208505,52278463)。

摘　　要：为探求侧风下的拱桥变形对列车平稳性的作用机理,通过风-车-桥耦合系统得到跨中横、竖向位移,分析不同风速、车速下的列车行车平稳性,量化桥梁变形对风-车-桥系统中列车横、竖向加速度的贡献;结合车体加速度响应的敏感波长及桥梁变形的时频特性,分析桥梁变形对行车平稳性影响机理.结果表明:桥梁竖向位移差异较横向位移差异较小,且主要位移由车致桥梁变形产生,最大幅值达到了-9.2mm;在列车及风荷载作用下,桥梁横向及竖向位移较为显著,但其对列车平稳性的影响主要体现在交界墩位置处,约为其余位置响应的4倍;除交界墩区域,桥上列车的行车平稳性主要由风致列车振动及轨道不平顺决定;车体横向及竖向加速度功率谱密度分布与轨道不平顺的波长密切相关,其对应的敏感波长区间均小于120m;车体横向及竖向加速度主要受车辆荷载作用引起的桥梁变形影响,而风荷载引起的桥梁变形主要分布于主跨范围内,波长大于120m,因而未对列车车体加速度产生显著影响.In order to explore the influence mechanism of arch bridge deformation on the running stability of the train under crosswind,the horizontal and vertical displacement of the mid-span was obtained through the wind,vehicle,and bridge coupling system,and the running stability of the train under different wind speeds and train speeds was analyzed.The contribution of bridge deformation to horizontal and vertical acceleration of the train in the wind,vehicle,and bridge system was quantified.Combined with the sensitive wavelength of the acceleration response of the train and the time-frequency characteristic of bridge deformation,the influence mechanism of bridge deformation on running stability was analyzed.The results show that the vertical displacement difference of the bridge is smaller than the horizontal displacement difference,and the main displacement is caused by the vehicle-induced bridge deformation.The maximum value reaches−9.2 mm.Under the action of train and wind load,the horizontal and vertical displacement of the bridge is more significant,but its influence on the stability of the train is mainly reflected in the position of the junction pier,which is about four times the response of other positions.Except for the junction pier area,the running stability of the train on the bridge is mainly determined by the wind-induced train vibration and track irregularity.The spectral density distribution of horizontal and vertical acceleration power of the train is closely related to the wavelength of track irregularity,and the corresponding sensitive wavelength range is less than 120 m.The horizontal and vertical acceleration of the train is mainly affected by the bridge deformation caused by the vehicle load,while the bridge deformation caused by wind load is mainly distributed in the main span,and the wavelength is larger than 120 m.Therefore,it does not exert a significant impact on the acceleration of the train.

关 键 词：高速列车 行车平稳性 桥梁变形 风荷载 风-车-桥系统 

分 类 号：U441.7[建筑科学—桥梁与隧道工程] U211[交通运输工程—道路与铁道工程]