Analysis of the dynamic wheel-loading characteristics affected by track vertical irregularity for train speed of 300km/h

In the railway field, concrete tracks have fewer problems such as displacement and track irregularities than ballast tracks. However, due to settlement of earthwork sections, track irregularities have occurred in high-speed railways constructed with concrete track. In Korea, train stability has been considered mainly for track irregularity sections and study on load transferred to track and trackbed has been insufficient. In this study, changes of dynamic wheel-load during high-speed running are analyzed in earthwork sections where track vertical irregularity has occurred. Using the moving loading method, numerical analyses were conducted to investigate the maximum stress. Rail surface leveling was performed to select measurement points, and the dynamic wheel loads for each point were measured for train speed of 300km/h. The characteristics of load acting on the rail were analyzed by comparing a normal section and a defective section for which track vertical irregularity has occurred.