Abstract: Wooden sleepers are traditionally used to transmit live loads on railway steel bridges in China. Although wood has good elasticity and insulation properties, it has the disadvantages of large amount of wood and cumbersome maintenance and repair. Composite sleepers can be similar in shape and weight to wooden pillows. Composite sleeperswhichcan be designed in terms of shape and weight are similar as wooden pillows. In order to study the applicability of the composite material sleeper on the 30 t axle mass load railway,coupling vibration analysis of the 64m single-wire railway underpinning with wooden pillow and composite material sleeper was carried out. At different speeds through the bridge to examine the dynamic performance of train and bridge. The results show that:in the case of different types of sleeper, the vertical displacement and acceleration of the train are lower than the standard limit for the bridge, and the traffic safety requirements are satisfied. For the train, wheel load reduction and body vibration are also required to meet the requirements, and pavement or composite pillow when the system dynamic response is no significant difference. The stress of the composite sleeper is larger than that of the pillow, but still far less than the allowable stress of the composite sleeper. The deformation of the composite sleeper is less than that of the pillow, the deformation is less than permissible deformation;for the composite sleeper, although the load near the force point of the sleeper is bigger than the pillow, but the gap between the two is less than 2%, basically the same.therefore, composite sleepers can meet the trainin the range of 60~90 km/h safe and stable operation requirements and suitable as a substitute for wooden pillows.

Key words: omposite material sleeper, safety, stability, steel truss girder, train-track-bridge coupling vibration