Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Experimentally Evaluating Fatigue Behavior of Corroded Steels Exposed in Atmospheric Environments

대기환경하에서 장기간 사용된 부식강재의 실험적 피로거동평가

  • Mun, Jae Min (Dept. of Civil Engineering, Pusan National University) ;
  • Jeong, Young Soo (Seismic Simulation Test Center, Pusan National University) ;
  • Jeon, Je Hyeong (Dept. of Civil Engineering, Pusan National University) ;
  • Ahn, Jin Hee (Dept. of Civil Engineering, Gyeongnam National University fo Science and Technology) ;
  • Kim, In Tae (Dept. of Civil Engineering, Pusan National University)
  • 문재민 (부산대학교, 사회환경시스템공학과) ;
  • 정영수 (부산대학교, 지진방재연구센터) ;
  • 전제형 (부산대학교, 사회환경시스템공학과) ;
  • 안진희 (경남과학기술대학교, 토목공학과) ;
  • 김인태 (부산대학교, 사회환경시스템공학과)
  • Received : 2017.02.12
  • Accepted : 2017.04.12
  • Published : 2017.06.27
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Abstract

Fatigue strength of temporary steels and painted structural steels corroded under outdoor atmospheric environments is not clear. In this study, fatigue tests were carried out on steel plates which were cut off from 7-year-old temporary structural member under subway construction environment and from 75-year-old Yeongdo bridge member under marine atmospheric environment. After removing corrosion production on the steel surface, 3-dimensional surface geometry of the corroded steel was measured at intervals of $1.0{\times}1.0mm$, and corrosion characteristics such as minimum, maximum and mean values of residual thicknesses were calculated. From the fatigue test and FEM analysis results, the relationship between corrosion characteristics and fatigue behavior was presented, and change in fatigue strength of the unpainted and painted steels corroded in outdoor environments was also presented.

실제 옥외 대기환경하에서 부식손상된 무도장 가시설 강재 및 도장 강재의 피로강도는 명확하지 않다. 본 연구에서는 약 7년간 지하철 공사현장에서 사용된 가시설 부재와 극심한 해양 부식환경하에서 75년간 사용된 영도대교 강부재로부터 절취한 강재의 피로실험을 실시하였다. 그리고 강재 표면의 부식 생성물을 제거한 후 강재 표면의 3차원형상을 측정하여 최대, 최소 및 평균 잔존두께를 계산하였다. 피로실험결과 및 FEM해석 결과에 근거하여 부식특성과 피로강도와의 상관관계를 검토하였으며, 실제 옥외 환경하에서 부식된 무도장 및 도장 강재의 피로수명 평가식도 제시하였다.

Keywords

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