【摘要】 以车桥耦合动力学理论为基础,对某环道线特大桥进行车桥耦合振动性能研究,并对小半径曲线区段简支槽型梁桥直梁与曲梁布置方案的列车动力响应进行了对比分析,着重讨论了两种方案对桥梁刚度、竖向动位移、横向动位移、扭转效应以及列车加速度、脱轨系数、轮对横向力、轮对减载率等指标的影响。研究结果表明:(1)列车以设计车速运行时,各项指标均满足规范要求;(2)曲梁布置方案列车动力响应值比直梁小;(3)桥梁曲线外侧各动力响应幅值均大于曲线内侧。更多还原

【Abstract】 Based on the theory of vehicle-bridge coupling dynamics,coupled vehicle-bridge vibration performance of a super major bridge on a circuit line is studied.The impacts of bridge arrangement schemes on the dynamic responses of vehicles in the section with small radius are comparatively analyzed,where straight and curved beams schemes with simple girder supports are included.In terms of dynamic responses,indicators such as bridge stiffness,vertical and dynamic displacement,lateral dynamic displacement,torsional effect and vehicle acceleration,derailment coefficient,wheel transverse force and wheel load shedding ratio are discussed emphatically.Results indicate that:(1) All indicators considered can meet the requirements of regulations when vehicles run in the designed speed;(2) Responses of vehicles are weaker in the scheme of curved bridge;(3) The magnitudes of all indicators at lateral side are larger than those at medial side.更多还原