DOI QR코드

DOI QR Code

Experimental Study of Low-Frictional Behavior for Sliding Slab Track

슬라이딩 궤도의 저마찰 거동에 대한 실험적 연구

  • Received : 2016.11.29
  • Accepted : 2017.03.02
  • Published : 2017.04.30

Abstract

Railway bridges with continuously welded rail have a limitation of span length due to track-bridge interaction. In order to overcome this, a sliding slab track system has been developed that comprises with a low-frictional sliding layer between the bridge deck and the track slab to isolate the longitudinal behavior between the bridge and the track. In this study, a real scale track system is prepared to experimentally evaluate the longitudinal frictional behavior. Applied loading rates were 0.2, 1.0, 5.0 and 10mm/min; vertical mass on the track are track slab only, 5,000 and 10,000kg added mass, respectively. Test results showed that the resulting frictional coefficients varied from 0.22 to 0.33. In addition, 10,000 cycle loadings were applied to simulate repetitive sliding to represent 30 years of service life. The frictional coefficient increase was measured and found to be 7% of that of the initial loading stage, which means that the sliding layer is adequate to provide low-frictional behavior for the sliding slab track system. Effects of changes of the frictional coefficient of the sliding layer were analyzed by rail-structure interaction analysis.

장대레일이 부설된 철도 교량은 궤도-교량 상호작용으로 인하여 경간장 연장에 제약이 있다. 이러한 한계를 극복하기 위하여 궤도와 교량 사이에 저마찰 슬라이드층을 두어 교량과 궤도의 종방향 거동을 분리시켜 상호작용을 원천적으로 저감시키는 슬라이딩 궤도가 개발되고 있다. 본 연구에서는 슬라이드층을 포함하는 궤도 시스템을 실규모로 제작하여 종방향으로 반복하중을 재하하는 시험을 통하여 슬라이딩 궤도의 저마찰 거동을 종합적으로 평가하고자 하였다. 하중 재하 속도를 0.2, 1.0, 5.0, 10mm/min.으로 변화를 주었으며, 5,000, 10,000kg의 부가질량이 재하된 경우에 대한 마찰거동를 비교 검토하였다. 실험 결과 제안된 슬라이드층의 마찰계수는 0.22~0.33인 것으로 확인되었다. 더불어, 30년에 해당하는 10,000회의 반복하중을 재하하여 마찰계수 변화를 관찰한 결과, 마찰계수 증가는 7%에 머물러 반복하중에 대한 장기적인 내구성을 확보한 것으로 확인되었다. 슬라이드층의 마찰계수의 변화에 따른 영향을 상호작용 해석을 통하여 추가로 검토하였다.

Keywords

References

  1. K.C. Lee, S.Y. Jang, D.K. Jung, H.K. Byun (2015) Evaluation of stress reduction of continuous welded rail of sliding slab track from track-bridge interaction analysis, Journal of the Korean Society of Civil Engineers, 35(5), pp. 1179-1189. https://doi.org/10.12652/Ksce.2015.35.5.1179
  2. K.C. Lee (2014) Feasibility analysis of sliding slab track for reducing track-bridge interaction, Proceedings of the 2014 Spring Conference of the Korean Society for Railway, Changwon, Korea, pp. 916-920.
  3. K.C. Lee, I.H. Yeo, K.H. Kim, D.K. Jung (2014) Rail-Structure interaction analysis of sliding slab track, Proceedings of the 2014 Autumn Conference of the Korean Society for Railway, Jeju, Korea, pp. 165-169.
  4. K.C. Lee, S.Y. Chang, S.I. Kim, I.H. Yeo, K.H. Kim (2014) Sliding slab track reducing interaction between railway bridge and track, Proceedings of the Korean Institute of Bridge and Structural Engineers 2014 Technical Conference, Ilsan, Korea, pp. 105-106.
  5. K.C. Lee, S.Y. Chang, D.K. Jung, H.K. Byun, H.K. Park, T.S. Yang (2015) Rail-structure interaction analysis of sliding slab track on bridge, Proceedings of the Joint Rail Conference 2015, San Jose, CA, USA, Paper No. JRC2015-5661.
  6. K.C. Lee, S. Y. Chang, I.H. Yeo, C.E. Kim (2015) Preliminary design of continuously reinforced slab for sliding slab track, Proceedings of the 2015 Spring Conference of the Korean Society for Railway, Mokpo, Korea, pp. 56-61.
  7. K.C. Lee, S.C. Lee, S.Y. Jang, I.H. Yeo (2015) Estimation of cold-weather-cracking at concrete slab for sliding slab track, Proceedings of the 2015 Autumn Conference of the Korean Society for Railway, Yeosu, Korea, pp. 545-549.
  8. D.K. Jung, K.C. Lee, S.Y. Chang, I.H. Yeo, T.G. Kim (2015) Experimental study for friction behavior of sliding slab track, Proceedings of the 2015 Autumn Conference of the Korean Society for Railway, Yeosu, Korea, pp. 533-536.
  9. K.C. Lee, S.Y. Jang, J. Lee, H.S. Choi (2015) Track-bridge interaction analysis technique for railway bridges with continuous welded rail, Proceedings of the Korean Institute of Bridge and Structural Engineers 2015 Technical Conference, Uiwang, Korea, pp. 25-26.
  10. K.C. Lee, S.Y. Jang, J. Lee, H.S. Choi (2016) Comparative analysis of track-bridge interaction of sliding slab track and rail expansion joint for long-span railway bridge, Journal of Computational Structural Engineering Institute of Korea, 29(2), pp. 169-177. https://doi.org/10.7734/COSEIK.2016.29.2.169
  11. S.C. Lee, K.C. Lee (2016) Crack width check on sliding railway slab in winter, Proceedings of the Spring Conference of Korea Concrete Institute, Yeosu, Korea, pp. 181-182.
  12. D.K. Jung, K.C. Lee (2016) Evaluation of additional rail stress for partial application of sliding slab track, Proceedings of the 1st Asian Conference on Railway Infrastructure and Transportation, Jeju, Korea, pp. 276-279.
  13. K.C. Lee, T.G. Kim, D.K. Jung (2016) Experimental study of low-frictional behavior for sliding slab track, Proceedings of the 1st Asian Conference on Railway Infrastructure and Transportation, Jeju, Korea, Paper No. ART 2016-235
  14. P. Wang, J.J. Ren, R. Xiang, X.Y. Liu (2012) "Influence of rub-plate length on forces and displacements of longitudinally coupled slab track for a bridge turnout." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 226(3), pp. 284-293. https://doi.org/10.1177/0954409711420776
  15. ASTM (2001) Standard Test Method for Static and Kinetic Coefficients of Frictions of Plastic Film and Sheeting, D 1894-01.
  16. H.Y. Lee (2005) Friction Wear Engineering, Taeilsa.
  17. P.J. Blau (2009) Friction Science and Technology from Concepts to Applications, CRC Press, Boca Raton, pp. 1-208.
  18. L.W. Teller, H.L. Bosley (1936) The arlington curing experiments, Public Roads, 16(9), pp.169-197.
  19. S.W. Lee (2000) Horizontal joint movements in rigid pavements, The Pennsylvania State University Ph.D. Dissertation.