철도교량상의 장대레일 축력 해석 기법 개발

초록

Railway bridges have a significant effect on stress and displacement of continuous welded rail (CWR). At high temperatures, longitudinal compressive forces can cause track buckling combined with braking or acceleration forces. On the other hand rail breakage can be occured at low temperatures under the combined influence of longitudinal tensile forces and braking forces. Therefore, it is very important to investigate these problems for thorough counter measures, especially in high speed rail which requires high safety. The exact evaluation of longitudinal forces of rail is the key to the solution. In this thesis, a numerical method for the evaluation of longitudinal forces of CWR on railway bridges is developed. The characteristics of sequential application of temperature loadings in rail and bridge and braking forces exerted by trains are considered in the method. The increase effects of longitudinal track resistance due to train climbing on track are also taken into account. The method is verified by comparing the results of analyses of numerical examples, which conducted between those using PROLIS, a computer program developed by Delft University and those by this study.