T构梁温度和收缩徐变效应对磁浮车-轨-桥耦合振动的影响  

Influence of Temperature and Shrinkage Creep Effects of T⁃shaped Rigid Frame Girder on Coupled Vibration of Urban Maglev Vehicle⁃Track⁃Bridge System

作　　者：娄会彬[1,2] 彭也也 赵春发[1] 冯洋 魏高恒 魏凌云 LOU Huibin;PENG Yeye;ZHAO Chunfa;FENG Yang;WEI Gaoheng;WEI Lingyun(State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China;China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)

机构地区：[1]西南交通大学轨道交通运载系统全国重点实验室,成都610031 [2]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道建筑》2025年第1期93-98,共6页Railway Engineering

基　　金：中铁第四勘察设计院集团有限公司科技开发计划(2022K015)。

摘　　要：T构梁在长期服役过程中易受到温度和收缩徐变效应的影响而发生较大变形,而中低速磁浮交通对轨道梁的变形等要求十分严格。本文建立了细致的T构梁有限元模型及包含PID(Proportional Integral Derivative)反馈控制的6节编组中低速磁浮车辆动力学模型,仿真计算了考虑T构梁温度和收缩徐变前后,磁浮车辆以20~160 km/h速度通过T构梁时车-轨-桥耦合系统的动力学响应。结果表明:考虑T构梁20℃升温温差和10年收缩徐变后,F轨轨面形成了9.47 mm的静态几何不平顺。磁浮车辆以160 km/h通过T构梁时,F轨竖向振动加速度幅值比不考虑温度、收缩徐变工况下增加显著,增幅为10.0%,轨道梁动挠度和竖向加速度变化甚微,车体竖向加速度增幅为44.2%。车-轨-桥系统动力学响应随车速增加而增大,在160 km/h时取得最大值。梁体最大竖向振动加速度为0.11 m/s^(2),车体最大竖向振动加速度为0.59 m/s~2,悬浮间隙波动幅值达2.53 mm。车辆Sperling平稳性指标随车速提高而增大,最大值为2.42,乘坐舒适性等级仍为优秀。T构梁的温度和收缩徐变主要影响车辆高速运行时的平稳性和舒适性,该T构梁能满足磁浮车辆的安全平稳运营。T-shaped rigid frame girder is susceptible to large deformations due to temperature and shrinkage creep effects of concrete during long-term service.However,the requirements for deformation of track beams in medium and low maglev transportation are very strict.A detailed finite element model of a T-shaped rigid frame girder and a dynamic model of a 6-car medium and low maglev vehicle with PID(Proportional Integral Derivative)feedback control were established in this paper.The dynamic response of the vehicle-track-bridge coupling system when the maglev vehicle passes through the T-shaped rigid frame girder at a speed of 20~160 km/h before and after considering the temperature and shrinkage creep of the T-shaped rigid frame girder was simulated and calculated.The results show that after considering the 20℃temperature difference and 10-year shrinkage and creep of the T-shaped rigid frame girder,a static geometric roughness of 9.47 mm was formed on the F-rail surface.When the maglev vehicle passes through the T-shaped rigid frame girder at a speed of 160 km/h,the amplitude of the vertical vibration acceleration of the F-rail increases significantly compared to the condition without considering temperature,shrinkage and creep,with an increment of 10.0%.The dynamic deflection and the acceleration of the track beam change very little,and the vertical acceleration increment of the vehicle body is 44.2%.The dynamic response of the vehicle-track-bridge system increases with the increase of vehicle speed and reaches its maximum value at 160 km/h.The maximum vertical vibration acceleration of the beam is 0.11 m/s^(2),the maximum vertical vibration acceleration of the vehicle body is 0.59 m/s^(2),and the fluctuation amplitude of the suspension gap is 2.53 mm.The Sperling stability index value of the vehicle increases with the increase of vehicle speed,with a maximum value of 2.42,and the ride comfort level is still excellent.The temperature and shrinkage creep of T-shaped rigid frame girder mainly affect the stability and c

关 键 词：T构梁 中低速磁浮车辆 仿真计算 温度和收缩徐变效应 耦合振动 

分 类 号：U448.231[建筑科学—桥梁与隧道工程]