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Effects of Transverse Cracks on Stress Distributions of Continuously Reinforced Concrete Tracks Subjected to Train Loads

연속철근 콘크리트궤도의 횡균열이 열차 하중에 의한 응력 분포에 미치는 영향

  • Bae, Sung Geun (Department of Civil and Environmental Engineering, University of Ulsan) ;
  • Choi, Seongcheol (Department of Civil and Environmental Engineering, Chung-Ang University) ;
  • Jang, Seung Yup (High-speed Railroad Research Center, Korea Railroad Research Institute) ;
  • Cha, Soo Won (Department of Civil and Environmental Engineering, University of Ulsan)
  • Received : 2014.03.24
  • Accepted : 2014.09.24
  • Published : 2014.10.31

Abstract

The restrained volume changes of concrete due to variations of temperature and moisture produce transverse cracks in continuously reinforced concrete tracks (CRCTs). Such cracks are known to significantly affect the behaviors and long-term performance of CRCT. To investigate the effects of the transverse cracks on the behavior of CRCT and to develop more reasonable maintenance standards for cracks, in this study, the stress distribution of the track concrete layers (TCL) and the hydraulically stabilized base course (HSB) with transverse cracks were numerically predicted by a three dimensional finite element analysis when CRCT was subjected to train loads. The results indicate that the bending stresses of TCL and vertical stresses at the interfaces between TCL and HSB increased as the cracks were deepened. In addition, vertical stresses were locally concentrated near reinforcing steel in cracks in TCL when full-depth cracks developed, which may lead to punch-outs in CRCTs. Comparably, the effects of crack width and spacing were not as significant as crack depth. This study indicates that ensuring the long-term performance of CRCTs requires adequate maintenance not only for crack width and spacing but also for crack depth. Our results also show that locating HSB joints between sleepers is beneficial to the long-term performance of CRCTs.

Acknowledgement

Supported by : 국토교통부

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