Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Bond Strength and Development Length Model for Corroded Reinforcing Bars

부식된 철근의 부착강도 및 정착길이 산정모델

  • Han, Sun-Jin (Department of Architectural Engineering, Jeonju University) ;
  • Lee, Deuckhang (Department of Architectural Engineering, Chungbuk National University)
  • 한선진 (전주대학교 건축공학과) ;
  • 이득행 (충북대학교 건축공학과)
  • Received : 2024.05.28
  • Accepted : 2024.06.27
  • Published : 2024.09.01
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Abstract

This study aims to propose a simplified equation for estimating the bond strength of corroded reinforcing bars. To this end, extensive parametric analyses were performed using the detailed analysis method presented in the authors' previous study, where a wide range of critical variables were considered, such as compressive strength of concrete, net cover thickness, and reinforcing bar diameter. The sensitivity in bond strength of the corroded reinforcing bar according to each variable was evaluated. On this basis, a simplified formula for the bond strength of the corroded reinforcing bar was derived through regression analysis. The proposed equation was rigorously tested and verified using the bond test results of corroded reinforcing bars collected from the literature. The results confirmed that the proposed equation could estimate the bond strengths of specimens with better accuracy than the existing models, providing a reliable tool for engineers and researchers. In addition, the proposed equation was used to analyze the development length required for corroded tensile reinforcement to exert its yield strength, and it showed that the cover thickness of concrete must be at least four times the diameter of the reinforcing bar to achieve the yielding strength of reinforcing bar even at a corrosion degree of more than 5.0%.

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Acknowledgement

제1저자 한선진은 이 논문은 2023년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임에 감사드립니다 (RS-2023-00209480). 또한, 교신저자 이득행은 이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임에 감사드립니다(No. RS-2023-00209647).

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