Analysis of vibration characteristics for elevated CRST II slab track based on vehicle- track element

According to the characteristics of vehicle- CRST II slab track- bridge coupled interaction,a new type of vehicle element and track element were proposed. Finite element method and Lagrange equations were utilized to establish the dynamical finite element equations of these two elements. The difference between the new vehicle element and traditional one is that below every wheel there is a section of rail. And this rail is only used for the coupling between vehicle and track without considering its mass. Using this vehicle element,the explicit algorithms of moving vehicle- track coupled interaction can be built. In this case,it avoided complicated programming work. Considering the track structure vibration effect,the track element which is a cut section within the fastening- spacing and includes corresponding rail,fastenings,elastic pads,track slab,concrete base layer and bridge deck as well as a four- layer beam model of their interactions. Based on vehicle element and track element,the vertical vibration model of vehicle- track- bridge coupled system can be established. Specifically,the model proposed in this paper shows high performance in the numerical examples of previous research. The model verification indicates that the vehicle- CRST II slab track- bridge coupled model based on vehicle element and track element and its relevant numerical programs can be used to analyze and reflect the railway track structure's dynamic behavior.