Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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A Study on Applicability of Tensile Constitutive Model of Steel Fiber Reinforced Concrete in Model Code 2010

Model Code 2010에 제시된 강섬유 보강 콘크리트의 인장 구성모델 적용성 고찰

  • Yeo, Dong-Jin (Department of Civil Engineering, Kyung-Sung Univ) ;
  • Kang, Duk-Man (Graduate School of Railway, Seoul National University of Science & Technology) ;
  • Lee, Myung-Seok (Graduate School of Railway, Seoul National University of Science & Technology) ;
  • Moon, Do-Young (Department of Civil Engineering, Kyung-Sung Univ)
  • 여동진 (경성대학교 토목공학과) ;
  • 강덕만 (서울과학기술대학교 철도전문대학원) ;
  • 이명석 (서울과학기술대학교 철도전문대학원) ;
  • 문도영 (경성대학교 토목공학과)
  • Received : 2016.04.22
  • Accepted : 2016.08.23
  • Published : 2016.10.30
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Abstract

Tensile constitutive stress-strain model of steel fiber reinforced concrete (SFRC) in fib MC2010 was investigated. In order to model tensile behavior of SFRC, three point loading flexural tests were conducted on notched small beams according to BE-EN-14651. Design parameters for the constitutive model were determined from the flexural tests. Flexural test and finite element analysis were conducted on large SFRC beam without steel reinforcements and compared with each other. In addition, parametric study on the effect of compressive and tensile model, and characteristic length on flexural behavior of the SFRC beam was conducted also. In results, pre-peak load-displacement curves from the FE analysis was close to experimental curves but significant difference was shown in post-peak behavior. The reason of the difference is originated from the fact that the fiber distribution and orientation were not being properly considered in the MC2010 model. This study shows that modification and detail explanations on the orientation factor K in MC2010 might require to better reproduce the behaviour of large scale SFRC beams.

본 연구에서는 Model Code 2010에 제시된 강섬유 보강 콘크리트(SFRC)의 인장구성모델에 대하여 고찰하였다. SFRC의 인장 거동을 모델링하기 위하여 BS-EN-14651에 따라 노치를 갖는 작은 보의 3점재하 휨실험을 수행하였다. 이 실험결과를 토대로 인장구성모델의 다양한 설계인자를 결정하였다. 이형철근이 보강되지 않은 길이 3 m의 보의 휨파괴 실험과 유한요소해석을 수행하고 상호 비교하였다. 추가적으로 인장구성모델의 주요변수인 압축 및 인장모델과 특성길이가 보의 거동에 미치는 영향에 대한 변수해석을 수행하였다. 결과에서, 최대치 이전의 거동에서는 해석과 실험결과로부터 얻은 하중-변위곡선이 매우 유사하지만 최대치 이후에서는 중대한 차이가 있음을 확인하였다. 이는 MC2010의 인장구성모델이 섬유의 분포와 방향을 적절히 고려하지 못하기 때문이다. 본 연구는 철근이 보강되지 않은 실규모의 SFRC 보의 거동을 적절하게 모사하기 위해서는 MC2010에서 규정하고 있는 섬유방향 계수 K에 대한 수정 또는 상세한 설명이 필요하다는 것을 보여주고 있다.

Keywords

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