风-浪作用下跨海大桥列车-桥梁系统耦合振动仿真研究  

Coupled Vibration of Train-Bridge System of Cross-sea Bridge Subject to Wind and Wave

作　　者：崔圣爱[1] 郭晨[1] 张猛[1] 陈振 曹艺缤 祝兵[1] CUI Shengai;GUO Chen;ZHANG Meng;CHEN Zhen;CAO Yibin;ZHU Bing(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道学报》2021年第7期138-143,共6页Journal of the China Railway Society

基　　金：国家自然科学基金(U1834207)。

摘　　要：以一斜拉桥研究对象,计算了桥梁下部结构的波浪荷载。通过ICEM生成车桥的混合网格,在Fluent中计算了不同风浪组合下系统的气动荷载。利用Ansys和Simpack建立车-桥耦合模型,将风浪荷载以时程输入,研究不同组合下列车和桥梁动力学指标的变化规律。结果表明:当风速和车速一定时,随着波浪荷载重现期的增大,车桥系统的安全性与舒适性降低。列车的脱轨系数和轮对横向力随波浪荷载的变化最明显;桥梁跨中的竖向位移以及加速度与无波浪荷载相比变化较小,而横向指标则随之逐渐增大;当波高和车速一定时,系统的各项动力指标随着风速的提高均明显增大。列车的脱轨系数和轮对横向力的变化幅度最大;桥梁跨中竖向位移在风速达30 m/s时发生突变,而竖向加速度从无风环境到有风环境时发生突变,桥梁横向动力指标则随风速增大而显著增大。Based on the study of a cable-stayed bridge,the wave loads on the substructure of the bridge were calculated.The hybrid grid of train and bridge was generated by ICEM,and the aerodynamic loads of the system under different wind and wave combinations were calculated in Fluent.Based on Ansys and Simpack,the train-bridge coupling model was created,where the wind wave load was input as time history to study the change law of train and bridge dynamic indexes under different combinations.The results show that:when the wind speed and train speed are constant,the safety and comfort of the train-bridge system will decrease with the increase of wave load recurrence period.The derailment coefficient of the train and the lateral force of the wheelset change most obviously with the wave load.Compared with the non-wave load,the vertical displacement and acceleration of the middle span of the bridge change little,while the lateral index gradually increases;When the wave height and train speed are constant,the dynamic indexes of the system increase significantly with the increase of wind speed.The change extent of the train derailment coefficient and lateral force of the wheelset is maximum.The vertical displacement in the middle span of the bridge changes abruptly when the wind speed reaches 30 m/s,while the vertical acceleration changes abruptly from a calm environment to a windy environment.The lateral dynamic index of the bridge increases significantly with the increase of wind speed.

关 键 词：气动荷载 波浪荷载 动力响应 耦合 联合仿真 

分 类 号：U446[建筑科学—桥梁与隧道工程]