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.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2018年第1期31-38,共8页
China Railway Science
基金
国家自然科学基金资助项目(51705267)
中国铁路总公司科技开发计划项目(2015G007-A)
关键词
大跨度斜拉桥
沪通长江大桥
风—车—桥耦合系统
动力响应
风载荷
安全性
舒适性
Long-span cable-stayed bridge
Shanghai-Nantong Yangtze River bridge
Wind-train-bridge coupled system
Dynamic response
Wind load
Safety
Comfort
