波浪作用下跨海大桥列车走行性研究
Study of Train Running Performance under Wave Load for Cross-Sea Bridge

针对平潭海峡大桥所处海洋环境复杂恶劣、波浪会影响列车的安全性和舒适性问题，基于车-桥耦合动力仿真方法，利用自主研发的桥梁有限元软件BANSYS（bridge analysis system），分析了极端波浪荷载作用下车辆和桥梁的动力响应，讨论了波浪荷载重现期、车速、水深和桥墩刚度等因素的影响.研究结果表明：波浪荷载对车桥系统的响应影响显著，当波浪荷载重现期为50 a时，桥梁跨中横向位移超限；当波浪荷载较大时，波浪对列车走行性起主要控制作用，当波浪荷载较小时，车桥系统的动力响应对车速较为敏感；低桩承台方案可有效降低波浪荷载作用下桥梁和车辆的动力响应；桥墩基础采用常用的不同标号的混凝土对行车安全性和舒适性影响较小，车辆最大横向加速度相对变化幅值最高达3%.
：The Pingtan Strait Bridge is in a complex and harsh marine environment. The wave loads could affect traffic safety and comfortability.Based on the numerical simulation for coupling vibration of the rail vehicle-bridge system,our software-BANSYS (bridge analysis system) was adopted for analysing the dynamic responses of vehicles and the bridge under extreme wave loads.To estimate the return periods of the wave load, velocities, water depths, stiffness of bridge foundations, and the responses of vehicles and the bridge were analysed.The results show that wave loads have a significant impact on the responses of the vehicle-bridge system; when the return period of the wave load is 50 years, the lateral displacement of the midspan exceeds the standard limit. The wave loads play a major role in the train running performance; with large wave loads, the dynamic response of the vehicle-bridge system is more sensitive to vehicle speed than with small wave loads. The scheme of low pile cap can effectively reduce the dynamic response of the bridge and vehicles under wave loads. The different frequently-used concrete strengths of the bridge foundations have little influence on traffic safety and comfortability, and the relative change in the maximum acceleration of vehicles is up to 3%