Additional longitudinal forces transmission between bridges and continuously welded rails with small resistance fasteners

To lay continuously welded rails on railway bridges, small resistance fasteners are used to be applied to reduce the mutual interaction forces between the rails and the bridges.To the ballast track, there are distinct relative displacement among the rail, sleeper and beam. However, the former mechanics model in this aspect didn't take the influence of the displacement of the sleeper into account. Thus, there are obvious discrepancy between the theory and the practice cases. A new mechanics model revealing additional longitudinal forces transmission between the continuously welded rails and the bridges, which takes the influence of the mutual relative displacement between the rail, sleeper and beam into account, is established. An example is presented and the results are compared. The results show that the calculated results of the new model are less than that of the formers, especially in the case of the flexible pier bridges. Without the consideration of the displacement of the sleeper, this model is also suited for the analysis of the additional longitudinal forces transmission between the rails and bridges of ballastless track with small resistance fasteners. The calculated results also show that compared to the ballast bridge, the ballastless bridges have a much stronger additional longitudinal forces transmission between the continuously welded rails and bridges.