STUDY ON IMPACT LOAD RESPONSE OF THE PC SLEEPER FOR RAIL JOINT USING THREE-DIMENSIONAL NUMERICAL ANALYSIS MODEL

Abstract eng:
The purpose of this study is to clarify the influence of impact load due to train passing through the rail joint on the prestressed concrete sleeper (PC sleeper).The design of PC sleeper has been carried out in consideration of the influence of the impact load. Impact loads are caused by rail joints, irregularities of rail welded joints, rail corrugation, and wheel flat (damages generated on the wheel treads when the wheels slide on the rail running surface). Among them, the impact loads due to the rail joint and the wheel flats tend to be relatively large. In Japan, from the beginning of the development of the PC sleepers, the wheel flats have been recognized as one of the biggest factors of the impact load, and the studies on the influence of the impact load caused by the wheel flats on PC sleepers have been actively conducted. On the other hand, there have been few studies on the influence of the impact load caused by the rail joint on PC sleepers. In this study, we constructed a three-dimensional FE model of the PC sleeper which is able to simulate the nonlinear behavior of the PC sleeper. Using this analytical model, the influence of the impact load caused by the rail joint on the maximum bending moment and the stress generated in PC sleeper for various amounts of rail irregularity and various train speeds was quantitatively evaluated. In addition, the influence of parameters such as the amount of prestressing force, abrasion of PC sleeper, corrosion of PC steel wire were clarified. In the future, we plan to develop on optimum design method for PC sleeper for the rail joint considering the impact load caused by the rail joint using the result of the analysis.

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