Research on dynamic characteristics of transition zone with ballastless tracks of high speed railway

Based on experiments of dynamic characteristics and deformation behaviours for the structure system under the track of a transition zone, and together with full consideration of the space characters of the transition zone, a semi-infinite tri-dimensional spatial timing coupled dynamic FEM model is established to analyze roadbed-bridge transition zone with ballastless tracks on high speed railway. By applying the model, the influences of wheels' loads, vehicle's speeds, and material parameters on the dynamic responses of the system are studied systematically. The modelling process is carefully introduced and the calculation results are obtained and described in term of the three aspects mentioned above.