Analysis of Wheel Load Variation on Welded Rail Surface Irregularities

摘要

KTX trains, which began passenger service between Seoul and Busan in April 2004, have been very highly evaluated for their safe operation. The condition of the track is one of the most important means to maintain KTX safety. It is inevitable that some field welding to integrate the CWR(Continuous Welded Rail) take place so that rail joints can be removed on the high speed line. There is always the potential for some rail surface irregularity to arise due to limitations or flaws in the work carried out. If a high speed train runs on the rail surface that has irregularities at welding parts, big impact loads come to bear on that portion of the rail surface, so track irregularity cycle is reduced, and therefore the track maintenance cost will increase. This paper would like to find a track deformation trend through a comparative analysis from actual measurement data taken at these times. In the paper, it discusses the effect of cyclic dynamic load at welding parts. The KTX dynamic impact load was measured in accordance with some rail surface irregularities and how these track irregularities influenced the condition of the rail profile at welding parts on a high speed line were analyzed.