Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Damage Assessment of Reinforced Concrete Beams Under Flexural Failure Mode Using Acoustic Emission Testing

음향방출 기술을 이용한 철근콘크리트 보의 휨 파괴 손상평가

  • David Kim (School of Social Safety Engineering, Hankyong National University) ;
  • Seonglo Lee (Department of Civil Engineering, Mokpo National University) ;
  • Wonsuk Park (Department of Civil Engineering, Mokpo National University)
  • 김다위 (한경대학교 사회안전시스템공학부) ;
  • 이성로 (목포대학교 토목공학과) ;
  • 박원석 (목포대학교 토목공학과)
  • Received : 2022.09.29
  • Accepted : 2023.02.27
  • Published : 2023.04.30
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Abstract

In this study, a four-point bending test was conducted to assess and detect the damage to reinforced concrete structures using the acoustic emission (AE) technique. Based on the crack investigation results, flexural failure was classified into four stages and compared with the characteristic analysis results of AE parameters. The parametric characterization indicated that the activity of the primary AE signal was high in the early stage, and that of the second signal increased after the flexural cracks stabilized. Because the secondary AE signal included noise generated by friction, parameter-based analysis for damage assessment was performed using the primary signal; the secondary signal was used as complement. The activity analyses of the primary and secondary signals effectively classified crack propagation; however, determining the macrocracks and yielding of reinforcing bars had certain limitations. Nevertheless, applying the damage index with cumulative AE energy is a complementary technique for detecting and assessing structure damage that well detects the occurrence of macrocracks.

Keywords

Acknowledgement

This research was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government (MOTIE)[grant number 20191510301470].

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