揭惠铁路 72 m+72 m 槽箱组合梁桥车-线-桥耦合振动研究

Research on Train-rail-bridge Coupling Vibration of Jieyang-Huilai Railway (72+72)-m Groove Box Composite Girder Bridge

摘要:

为研究温度荷载引起的附加变形对桥上列车行车走行性的影响，基于车-线-桥耦合振动分析方法，分析了在温度荷载作用下72 m+72 m槽箱组合连续梁桥和桥上列车的动力响应，探明了结构在成桥运营阶段的变形对桥上轨道平顺性及列车安全性、舒适性的影响规律。结果表明：考虑温度荷载作用时，主梁竖向动力响应略有增大，其中主梁的跨中竖向位移受温度荷载作用影响较大；桥上列车的动力响应随着车速的增加而增大，考虑温度荷载作用时会放大车速对列车动力响应的影响；相较于CRH6F型动车组，C70货车运行时，桥梁的动力响应随着车速的变化不明显，尤其是桥梁的位移，但车辆动力响应对车速较为敏感。

Abstract:

In order to study the influence of additional deformation caused by temperature on the running performance of trains on the bridge, based on train-rail-bridge coupling vibration analysis method, the dynamic response of the (72+72)-m groove box composite continuous girder bridge and the trains on the bridge under additional deformation of temperature is analyzed. The influence law of structural deformation during the operation stage of the bridge on the track smoothness, the safety and comfort of trains on the bridge is verified. The results show that the vertical dynamic response of the main beam increases slightly when the additional deformation of temperature is considered, in which the mid-span vertical displacement of the main beam is greatly affected by the temperature additional deformation. The dynamic response of the train on the bridge increases with the increase of the train speed. The influence of the train speed on the dynamic response of train is amplified when the temperature additional deformation is considered. Compared with the CRH6F EMU multiple unit, the dynamic response of the bridge is not obvious with the change of train speed during the running of C70 truck, especially the displacement of the bridge, but the vehicle dynamic response is more sensitive to the train speed.