Slab Track Vertical Static And Dynamic Analysis

Ballastless track structure is considered to be the first choice for the 300-350km/h high-speed rail. Ballastless track being still in the development stage, its calculating research theory remains to be improved. Confronted with the tendency that slab track are extensively applied in the passenger line construction, it is of necessity to concentrate on the study concerning such aspects as the static and dynamic analysis of slab track.Borg slab ballastless track structure is employed in this paper, taking the ballastless track system as a beam—boards—entity—boards composite structure system, to establish a finite element model based on the composite structure system. Flexible point-supported beam model is adopted in the rail track and fastener is simulated by applying linear spring. The track plate and concrete supporting layer in the thickness direction are simulated by using the plate unit. The mortar is simulated by employing the entity unit according to its actual topology shape. And elastic foundation plate is used to simulate the concrete supporting layer. To eliminate the boundary effect, three track slabs in the model are selected to make calculations, taking the middle track slab as the study object. This paper also studies the analysis method of structural deformation and reaction force of ballastless track under the function of the heavy-loaded traction wheel. ANSYS command steams are programmed to calculate the result and obtain the solution of the static part. This method is simple and convenient and is of good versatility. It not only takes the geometry characteristic of each part of the structure into full consideration but also its material properties, which is both convenient and scientific.When the train passes the track at a certain speed, both the train and the track will generate vibrations in all directions which mainly come from the irregularity of the track. Stimulated by the irregularity, the vehicle will vibrate in the vertical, horizontal and longitudinal directions. Based on the fact that it is a coupled relationship between the vibration of the two systems, vehicle system and track system, and this coupled vibration finally has to output through the formation of structural transmission, the current study of dynamic response of the track structure are done by taking the wheel-rail stimulation as the input, the wheel-rail contact point as the interface and the wheel-rail interaction force as the link to establish two independent physical systems—vehicle system and rail system and by analyzing the mutual coupling relationship between the vehicle system and rail system. In this paper, all relevant indicators of the vehicle are calculated by employing MSC.ADAMS/Rail modeling and the track responses are calculated by applying the wheel-rail force to the corresponding vertical track dynamic model established by using ANSYS software to explore a new approach to solve the track dynamics problem.