Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Analysis of Factors Influencing Fire Damage to Concrete Using Nonlinear Resonance Vibration Method

비선형 공진기법을 이용한 콘크리트의 화재 손상 영향인자 분석

  • 박강규 (한국과학기술원 건설 및 환경공학과) ;
  • 박선종 (한국과학기술원 건설 및 환경공학과) ;
  • 임홍재 (경북대학교 과학기술대학 건설방재공학부) ;
  • 곽효경 (한국과학기술원 건설 및 환경공학과)
  • Received : 2015.02.09
  • Accepted : 2015.03.24
  • Published : 2015.04.30
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Abstract

In this study, the effects of different mix proportions and fire scenarios (exposure temperatures and post-fire-curing periods) on fire-damaged concrete were analyzed using a nonlinear resonance vibration method based on nonlinear acoustics. The hysteretic nonlinearity parameter was obtained, which can sensitively reflect the damage level of fire-damaged concrete. In addition, a splitting tensile strength test was performed on each fire-damaged specimen to evaluate the residual property. Using the results, a prediction model for estimating the residual strength of fire-damaged concrete was proposed on the basis of the correlation between the hysteretic nonlinearity parameter and the ratio of splitting tensile strength.

본 연구에서는 비선형 음향효과를 기반으로 한 비선형 공진기법을 도입하여 콘크리트의 배합비 및 화재 손상 조건(노출온도, 손상 후 경과기간)이 화재 손상 콘크리트에 미치는 영향을 파악하였다. 도입된 비선형 공진기법을 통해 기존 선형 탄성파 기반 평가 기법 대비 향상된 민감도를 나타내는 비선형인자를 측정하였으며, 쪼갬 인장강도 측정을 통해 배합비 및 화재 손상 조건에 따른 콘크리트의 잔존재료물성 평가를 수행하였다. 얻어진 결과를 토대로 배합비, 노출온도, 손상 후 경과기간이 화재 손상 콘크리트에 미치는 영향을 분석하였다. 추가적으로 쪼갬 인장강도비와 비선형인자의 직접적인 관계를 제시하였으며, 비선형 공진기법을 이용한 화재 손상 콘크리트의 잔존 강도 추정에 대한 가능성을 확인하였다.

Keywords

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