Concrete Filled Steel Tubular Beam - Arch Creep And Temperature Deformation Response To Impact Studies, The Axle System Dynamics

The Concrete-Filled steel tubular arch bridge is a new type of bridge which has developed in recent years. It is widely used in High-speed rail bridges for its beautiful shape. The deflection caused by temperature or Shrinkage and creep of continuous beam concrete-filled steel tubular arch bridge affects the track irregularity and it affects the dynamic response of the vehicle-bridge system when acrossing the high-speed vihelce. Therefore, it study this problem, the vehicle-bridge coupling vibration analysis of the Zhenjiang Bridge of the Beijing-Shanghai high-speed railway is taken an example, meanwhile, the effect of tempreture, shrinkage and creep is taken into account. The works completed in this paper are as the following:1. The development and Structural characteristics of the Concrete-Filled steel tubular arch bridge and girder and arch combination bridge is summarized, the actuality of our high-speed railway is introduced, the necessity of vehicle/bridge coupling vibration analysis to this type of bridge and the effect of shrinkage and creep are expounded.2. The finite element model is established with respect on the continuous beam concrete-filled steel tubular arch bridge and the free vibration characteristic of this bridge is analyzed.3. Dynamic response of the vehicle-bridge system is analyzed when ICE3 high-speed train and China-made high-speed train across the bridge at different speed respectivly. We could come to the conclusion as follow: The dynamic responses of the bridge are all within the allowed values when the influence of Shrinkage and creep, tempreture effect are considered. The vertical acceleration, rate of wheel load reduction, and the vertical Sperling index, Derailment coefficient and the Wheel-rail lateral force of the train are compared and analyzed. It is proved that the track irregularities coursed by Shrinkage and creep and tempreture effect have great impact on the running property of the vehicle, so great attions should be paid to this problem at the stage of bridge design.