突变阵风对列车动力响应及行车安全性的影响  

THE EFFECT OF SUDDEN GUSTS ON THE DYNAMIC RESPONSES AND DRIVING SAFETY OF TRAINS

作　　者：陈宁[1] 游星呈 汪维安 李永乐[3] CHEN Ning;YOU Xing-cheng;WANG Wei-an;LI Yong-le(School of Civil Engineering,Hu’nan University of Science and Technology,Xiangtan,Hu’nan 411201,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu,Sichuan 610041,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]四川省公路规划勘察设计研究院有限公司,四川成都610041 [3]西南交通大学桥梁工程系,四川成都610031

出　　处：《工程力学》2023年第8期224-234,共11页Engineering Mechanics

摘　　要：突变阵风因风速在短时内发生瞬时变化容易对高速列车的行车安全性造成威胁。根据一维多变量非平稳随机过程理论,模拟了空间相关的时变阵风脉动风速场。采用多体动力学软件SIMPACK和有限元分析软件ANSYS,建立了42自由度的刚性列车与柔性轨道-桥梁相互作用的刚柔耦合模型,考虑横风向时变阵风的影响,基于刚柔耦合法形成了较为完善的风-列车-轨道-桥梁耦合动力学分析系统。以大跨度拱桥为工程背景,分析了时变阵风在不同车速和风速下对列车和桥梁动力响应特性及行车安全性的影响。结果表明:阵风对桥梁和车辆的动力响应具有重要的影响;在相同条件下考虑阵风影响时,主跨跨中横向位移增幅达到了200%,车辆的轮重减载率、脱轨系数相比于不考虑阵风时增大近30%;在风速大于25 m/s,车速大于80 km/h,轮重减载率将超过安全限值,表明车辆可能发生脱轨。Sudden gusts are likely to threaten the running safety of high-speed trains due to the instantaneous change of wind speed in a short time.Based on the theory of one-dimensional multivariable non-stationary stacastic process,the fluctuating wind fields are simulated for the spatially correlated time-varying gusts.With the help of multi-body dynamics software SIMPACK and finite element software ANSYS,a rigid-flexible coupling model for the interaction between rigid trains with 42-degree-of-freedoms and flexible track-bridge is established.Considering the influence of the time-varying crosswind gusts,a relatively compelete wind-vehicle-track-bridge coupling dynamics analysis system is formed based on the rigid-flex coupling method.Taking a long-span arch bridge as engineering case,the effects of time-varying gusts on the dynamic responses of train and bridge are analyzed with focus on the driving safety of trains under the influence of gusts with different vehicle speeds and wind velocities.The results indicate that the gusts have an important influence on the dynamic responses of bridges and vehicles.Under the same conditions,the lateral displacements of the main span increase up to 200%considering the influence of gusts while the wheel load reduction rate and derailment coefficient of the vehicle are increased by nearly 30%compared with no gusts.When the wind speed is greater than 25 m/s and the vehicle speed is greater than 80 km/h,the wheel load reduction rate will exceed the safety limit,indicating that the vehicle may derail.

关 键 词：桥梁工程 风-车-桥系统 联合仿真 SIMPACK 横风 “中国帽”阵风 

分 类 号：U24[交通运输工程—道路与铁道工程] TB122[理学—工程力学]