반복하중재하에 따른 레일패드 강성변화 예측

Recently, Change stiffness of Railpad is raising interested in the Railway. The railpad protects the sleeper from wear and provide electrical insulation. They also affect the dynamic behaviour of the whole track since the stiffness and damping of the track are influenced by the properties of the railpad. A wheel force becomes large as increasing the stiffness of rail-pad, and it accelerates the deterioration of track, and it leads the maintenance cost rising. So, it is required to determine an appropriate replacement period for rail-pad. In part of the study, repeated load test in laboratory was carried out, the result was used for predicting the stiffness change of railpad under moving train.