A Study on Estimation of Fatigue Life of Aged Continuous Welded Rail using the Field Test

현장측정을 통한 노후 레일의 피로수명 평가에 관한 연구

  • 공선용 (서울산업대학교 철도전문대학원 철도건설공학과, 서울메트로 철도토목팀) ;
  • 성덕룡 (서울산업대학교 철도전문대학원 철도건설공학과) ;
  • 김준형 (서울산업대학교 철도전문대학원 철도건설공학과) ;
  • 박용걸 (서울산업대학교 철도전문대학원 철도건설공학과)
  • Published : 2007.11.08

Abstract

It is essential to reduce track maintenance costs and to extend the periodic replacements of continuous welded rails based on accumulated passing tonnage. As recently train load decrease and rail joints wear down less, the periodic replacements of continuous welded rails can be extended. There are many kinds of rail damage like squat, head-check and corrugation. These can be taken nondestructive or naked eye test. So the periodic replacements of continuous welded rails based on accumulated passing tonnage were examine with focusing on a crack of rail bottom of continuous welded rail. Therefore, this study measure dynamic response of track by metro train load, it compute impact coefficient and track spring coefficient for estimating a condition of actual track system. Also, it is converted the measured stress waveform into stress frequency histogram by the rain-flow counting methods, and then the equivalence of stress is calculated. As apply s-n curve of a new welded rail, accumulated fatigue damage ratio of laid rail and remaining service lives is estimated. This study suggest a plan of the periodic replacements of continuous welded rails based on accumulated passing tonnage classified by the types of track system.

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