The Displacement Limit at the End of an Approach Slab for a Railway Bridge with Ballastless Track

콘크리트궤도 부설 교량의 접속슬래브 단부 처짐한도에 관한 연구

  • 최진유 (한국철도기술연구원 궤도토목연구본부) ;
  • 양신추 (한국철도기술연구원 궤도토목연구본부)
  • Published : 2008.04.30


The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab could be installed to prevent such a phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and increasing the track deteriorations by excessive impact force acting on the track. In this study, parametric studies were performed to investigate the displacement limit on the approach slab to avoid such problems. The length and the amount of unequal settlement of approach slab were adopted as parameter for numerical analysis considering vehicle-track interaction. Car body accelerations, variations of wheel force, stresses in rail, and uplift forces induced on fastener clip were investigated. From the result, resonable settlement limit on the end of an approach slab according to slab length was suggested.


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