多荷载作用下上海长江大桥列车走行性  

Ride quality of trains moving on Shanghai Yangtze River Bridge considering effect of multiple loads

作　　者：吴定俊[1] 陈锐 李奇[1] WU Ding-jun;CHEN Rui;LI Qi(Department of Bridge Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]同济大学桥梁工程系

出　　处：《长安大学学报（自然科学版）》2019年第3期65-73,83,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51278374)

摘　　要：为研究上海长江大桥在风、汽车荷载、温度、道路不平顺多因素影响下的列车走行性,将其视作温度变形、公路与轨道不平顺作用下的风-车-桥耦合动力系统。建立桥梁、列车车辆、不同类型汽车的有限元模型,采用模态叠加法进行车-桥动力计算。计算中运用随机交通流模型模拟公路交通流,采用文献中针对该桥风洞试验测定的主梁及车辆的气动参数,并将年温差引起的桥梁变形叠加到轨道和路面随机不平顺中。采用自编车-桥耦合计算软件VBC进行风-车-桥耦合动力分析。分别考虑了有无风荷载作用下温度荷载、汽车车流类型和列车运行方式的影响,并对多荷载作用组合下的极限状况进行讨论,分别考虑了列车空员、定员和满员3种不同载重的影响。最后,根据不同车速和风速组合下的计算结果,确定轮对横向力为列车走行性的控制指标,并提出了列车安全、舒适运行的管理原则。研究结果表明:年温差和汽车车流对列车动力响应的影响并不明显,列车响应随车速、风速的增大而增大;列车相对于风向的运行方式对列车走行性也有很大影响;在较高风速下,单线列车迎风侧行驶为列车的最不利运行方式;当风速小于20m/s时,最高运营车速可达到90km/h;当风速大于20m/s且不超过25m/s时,运营车速应小于70 km/h;当风速超过25m/s时,应当封闭轨道交通。In order to investigate the ride quality of trains moving on the Shanghai Yangtze River Bridge subjected to multiple environmental loads, the wind, road irregularity, temperature, highway and railway loads were taken into account in the wind-vehicle-bridge coupled system. Finite element models of the bridge, railway vehicles, and the different types of highway vehicles were developed and their modal results were then extracted for the vehicle-bridge dynamic interaction analysis using the mode superposition method. A random traffic flow model was applied to simulate the highway traffic flow, the test aerodynamic parameters of the train and bridge reported in other literature were used. The deformation of the bridge induced by annual temperature variation was added to the random irregularities of the rail and road. The self-complied vehicle-bridge coupling software VBC was used to calculate the responses of the wind-vehicle-bridge dynamic interaction system. The effect of temperature load, highway vehicle types, train operation mode, with wind load or not, and train operation modes with respect to the wind direction were considered. The effects of extreme load combinations were investigated by considering the situations of trains with empty, capacity, and full passenger loads. Based on calculations at different train speeds and wind speeds, it was found that the lateral forces of the wheelsets control the ride quality of train. The guidelines for the safe and comfortable operation of the train were proposed. The results show that the annual temperature variation load and highway traffic flows have negligible effect on the ride quality of the trains. The dynamic responses of the trains increase with an increase in the train and wind speeds. The mode of operation relative to the direction of wind of the trains also has a significant effect on the ride quality of the trains. At high wind speeds, a single train traversing on the windward side is the most unfavorable operation mode, when the wind speed is less than 20 m

关 键 词：桥梁工程 风车桥系统 耦合振动 走行性 斜拉桥 模态叠加法 随机车流 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]