沪通长江大桥主桥风—车—桥动力响应研究
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摘要
将轨道不平顺作为系统的内部激励,风载荷作为外部激励,考虑静风力和脉动风力,采用自编程序TYWTB建立车桥耦合系统动力学模型,进行不同风速激励下不同速度列车通过桥梁时的系统动力响应分析,并对车辆的安全性和舒适性进行评价。结果表明:随着风速的增加,车桥系统的动力响应增大,中跨最大垂向动挠度和横向动位移均出现在行车侧上弦;随着车速的增加,车桥系统的动力响应增大,桥上车辆的安全性和舒适性随车速的增加而降低;桥面风速等于或小于25m·s~(-1)时,160~250km·h~(-1)车速范围内车辆响应未超限值;当桥面风速达到30m·s~(-1)时,160~250km·h~(-1)范围内动车横向加速度均超限,拖车在车速250km·h~(-1)时轮重减载率超限,行车安全无法保证;由于沪通长江大桥桥梁对车辆受风面的遮挡,平均风速达到25m·s~(-1)时仍能保证车辆的运行安全和乘坐舒适,满足《铁路技术管理规程》的相关要求;沪通长江大桥铁路桥面采用了钢箱结构,增强了竖向、横向刚度和抗扭刚度,使得桥梁在风场和列车的共同作用下整体性能良好。
Taking the track irregularity as the internal excitation of the system and the wind load as the external excitation,considering the static and pulsating wind forces,the self-compiled software program TYWTB was used to build the dynamics model of train-bridge coupled system.The system dynamic responses when train passing bridges at different speeds under the excitations of different wind speeds were analyzed.The safety and comfort of the train were evaluated.Results show that,with the increase of wind speed,the dynamic response of train-bridge system increases,both the maximum vertical deflection and the lateral displacement of mid-span appear windings on train running side.With the increase of train speed,the dynamic response of train-bridge system increases,the safety and comfort of the train on bridge decreases with the increase of train speed.When the wind speed is equal to or less than 25 m·s~(-1),the dynamic response of train travelling at 160~250 km·h~(-1) does not exceed the limit.When the wind speed reaches 30 m·s~(-1),the lateral acceleration of motor car travelling at 160~250 km·h~(-1) is beyond the limit.The wheel load reduction rate of trailer car travelling at 250 km·h~(-1) exceeds the limit and the driving safety cannot be guaranteed.Since the wind-affected surface of the train is blocked by the Shanghai-Nantong Yangtze River Bridge,the average wind speed reaching 25 m·s~(-1) can still ensure the running safety and ride comfort,which meets the relevant requirements of"Railway Technology Management Regulations".Moreover,steel box structure is adopted for the deck of the Shanghai-Nantong Yangtze River Bridge to enhance the vertical,lateral stiffness and torsional stiffness,making the overall performance of the bridge good under the combined action of wind field and train.
Taking the track irregularity as the internal excitation of the system and the wind load as the external excitation,considering the static and pulsating wind forces,the self-compiled software program TYWTB was used to build the dynamics model of train-bridge coupled system.The system dynamic responses when train passing bridges at different speeds under the excitations of different wind speeds were analyzed.The safety and comfort of the train were evaluated.Results show that,with the increase of wind speed,the dynamic response of train-bridge system increases,both the maximum vertical deflection and the lateral displacement of mid-span appear windings on train running side.With the increase of train speed,the dynamic response of train-bridge system increases,the safety and comfort of the train on bridge decreases with the increase of train speed.When the wind speed is equal to or less than 25 m·s~(-1),the dynamic response of train travelling at 160~250 km·h~(-1) does not exceed the limit.When the wind speed reaches 30 m·s~(-1),the lateral acceleration of motor car travelling at 160~250 km·h~(-1) is beyond the limit.The wheel load reduction rate of trailer car travelling at 250 km·h~(-1) exceeds the limit and the driving safety cannot be guaranteed.Since the wind-affected surface of the train is blocked by the Shanghai-Nantong Yangtze River Bridge,the average wind speed reaching 25 m·s~(-1) can still ensure the running safety and ride comfort,which meets the relevant requirements of"Railway Technology Management Regulations".Moreover,steel box structure is adopted for the deck of the Shanghai-Nantong Yangtze River Bridge to enhance the vertical,lateral stiffness and torsional stiffness,making the overall performance of the bridge good under the combined action of wind field and train.
引文
[1]SUZUKI M,TANEMOTO K,MAEDA T.Aerodynamic Characteristics of Train/Vehicles under Cross Winds[J].Wind Engineering and Industrial Aerodynamics,2003,91:209-218.
[2]BAKER C,JONES J,LOPEZ-CALLEJA F,et al.Measurements of the Cross Wind Forces on Trains[J].Wind Engineering and Industrial Aerodynamics,2004,92:547-563.
[3]LI Yongle,QIANG Shizhong,LIAO Haili,et al.Dynamic of Wind-Rail Vehicle-Bridge Systems[J].Wind Engineering and Industrial Aerodynamics,2005,93:483-507.
[4]高芒芒.高速铁路列车—线路—桥梁耦合振动及列车走行性研究[D].北京:中国铁道科学研究院,2001.(GAO Mangmang.Study on Train-Track-Bridge Coupling Vibration and Train Performance on High Speed Railway Bridges[D].Beijing:China Academy of Railway Sciences,2001.in Chinese)
[5]杜宪亭,夏禾,张田,等.基于精细Runge-Kutta混合积分法的车桥耦合振动非迭代求解算法[J].振动与冲击,2013,32(13):39-42.(DU Xianting,XIA He,ZHANG Tian,et al.Non-Iterative Solving Algorithm for Coupled Vibration of a TrainBridge System Based on Precise Runge-Kutta Hybrid Integration Method[J].Vibration and Shock,2013,32(13):39-42.in Chinese)
[6]高芒芒,熊建珍,孙加林.铜陵长江大桥无砟轨道车线桥动力性能研究[J].中国铁道科学,2012,33(增):69-75.(GAO Mangmang,XIONG Jianzhen,SUN Jialin.Research on Train-Track-Bridge Dynamic Performance of Tongling Yangtze River Bridge with Ballastless Track[J].China Railway Science,2012,33(Supplement):69-75.in Chinese)
[7]中华人民共和国铁道部.GB 5599—1985铁道车辆动力学性能评定和试验鉴定规范[S].北京:中国标准局,1985.
[8]沈阳铁路局,铁道部科学研究院.运基线路[2001]274号秦沈客运专线线路养护维修暂行规定[S].北京:铁道部运输局,2001.
[9]铁道部标准计量研究所.TB/T 2360—1993铁道机车动力学性能试验鉴定方法及评定标准[S].北京:铁道部,1993.
[2]BAKER C,JONES J,LOPEZ-CALLEJA F,et al.Measurements of the Cross Wind Forces on Trains[J].Wind Engineering and Industrial Aerodynamics,2004,92:547-563.
[3]LI Yongle,QIANG Shizhong,LIAO Haili,et al.Dynamic of Wind-Rail Vehicle-Bridge Systems[J].Wind Engineering and Industrial Aerodynamics,2005,93:483-507.
[4]高芒芒.高速铁路列车—线路—桥梁耦合振动及列车走行性研究[D].北京:中国铁道科学研究院,2001.(GAO Mangmang.Study on Train-Track-Bridge Coupling Vibration and Train Performance on High Speed Railway Bridges[D].Beijing:China Academy of Railway Sciences,2001.in Chinese)
[5]杜宪亭,夏禾,张田,等.基于精细Runge-Kutta混合积分法的车桥耦合振动非迭代求解算法[J].振动与冲击,2013,32(13):39-42.(DU Xianting,XIA He,ZHANG Tian,et al.Non-Iterative Solving Algorithm for Coupled Vibration of a TrainBridge System Based on Precise Runge-Kutta Hybrid Integration Method[J].Vibration and Shock,2013,32(13):39-42.in Chinese)
[6]高芒芒,熊建珍,孙加林.铜陵长江大桥无砟轨道车线桥动力性能研究[J].中国铁道科学,2012,33(增):69-75.(GAO Mangmang,XIONG Jianzhen,SUN Jialin.Research on Train-Track-Bridge Dynamic Performance of Tongling Yangtze River Bridge with Ballastless Track[J].China Railway Science,2012,33(Supplement):69-75.in Chinese)
[7]中华人民共和国铁道部.GB 5599—1985铁道车辆动力学性能评定和试验鉴定规范[S].北京:中国标准局,1985.
[8]沈阳铁路局,铁道部科学研究院.运基线路[2001]274号秦沈客运专线线路养护维修暂行规定[S].北京:铁道部运输局,2001.
[9]铁道部标准计量研究所.TB/T 2360—1993铁道机车动力学性能试验鉴定方法及评定标准[S].北京:铁道部,1993.