DOI QR코드

DOI QR Code

Evaluation of Rail Fatigue and Bending Fatigue Considering Concrete Track Condition

콘크리트도상(STEDEF)의 선로조건을 고려한 레일휨응력 예측과 피로수명 산출

  • Lee, Soo-hyung (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology) ;
  • Kang, You-song (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology) ;
  • Park, Yong-gul (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology)
  • Received : 2017.10.18
  • Accepted : 2017.10.23
  • Published : 2017.10.31

Abstract

Rail is the main track component, playing the most important role in safe railways. For the sake of safety, it is strictly required to secure reliability against fatigue and destruction of rail. In this paper, by field measurement on concrete track, it is confirmed that the rail surface roughness and rail bending stress are linearly correlated with each other; the bending stress of rail can be presented as a function of train speed, track support stiffness, and rail surface roughness. The fatigue life of rail can be estimated by deriving the S-N curve through the fatigue test.

철도는 여객을 수송하기 위한 수단으로, 열차의 주행안정성과 탈선방지 등 절대적인 승객의 안전을 확보하는 것이 중요하다. 철도에서 사용하고 있는 레일은 여객을 안전하게 수송하는데 있어 가장 중요한 역할을 담당하는 궤도의 구성품이며, 안전을 위하여 레일의 피로, 파괴에 대한 신뢰성 확보가 엄격히 요구되고 있다. 본 논문에서는 콘크리트 궤도(STEDEF)의 현장측정을 통해 레일표면요철과 레일휨응력이 선형적인 상관관계가 있음을 확인하였으며, 레일표면요철, 궤도지지강성, 열차속도에 따른 레일의 휨응력예측식을 제시하였고, 실내 피로시험을 통해 S-N선도를 도출하여 레일 피로수명을 산정하였다.

Keywords

References

  1. M. Ishida (1990) Relationship between rail surface irregularity and bending fatigue of welded part in long rails, RTRI report.
  2. M. Ishida, T. Moto, A. Kono, Y. Jin (1999) Influence of loose sleeper on track dynamics and bending fatigue of rail welds, QR of RTRI.
  3. Y.G. Park, D.Y. Sung, H.K. Park, S.Y. Kong (2008) Bending fatigue life assessment of aged CWR using the field test, Journal of the Korean Society for Railway, 11(3), pp. 317-325.
  4. D.Y. Sung, Y.G. Park, D.C. Go, S.Y. Lee, R.K. Min (2010) The bending fatigue behavior analysis of rail by bending fatigue test, Journal of the Korean Society for Railway, 13(2), pp. 160-166.
  5. D.Y. Sung (2010) The fatigue life evaluation of rail by analysis of the vehicle/track interaction, PhD Thesis, Seoul National University of Science and Technology.
  6. D.W. Jo (2016) The estimation of fatigue life for CWR on concrete track with resilience pad in urban railway Seoul National University of Science and Technology.
  7. S.Y Kong (2016) A comparative study on the fatigue life for continuous welded rails between ballasted track and concrete track in urban transits, PhD Thesis, Seoul National University of Science and Technology.
  8. Y.G. Park, D.Y. Sung, K.W. Kim, H.S. Bae et al. (2012) The fatigue test and fatigue life evaluation for the aged continuous welded rail on the urban railway, Seoulmetro.
  9. S.Y. Kong, D.Y. Sung, Y.G. Park (2013) The fatigue life evaluation of aged continuous welded rail on the urban railway, Journal of the Korean Society of Civil Engineers, 33(2), pp. 821-831. https://doi.org/10.12652/Ksce.2013.33.2.821