Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Reinforcing effects of carbon fiber sheet by compressive strength differences on the RC slabs

도로교 RC 상판의 압축강도 차이에 따른 탄소섬유시트 보강효과

  • Won, Chan Ho (The Research Institute of Industrial Science, Hanyang University) ;
  • Abe, Tadashi (Dept. of Civil Engineering, College of Industrial Technology, Nihon University) ;
  • Ahn, Tae-Ho (International Sustainable Engineering Materials (ISEM) Center, Ceramic Materials Institute & Division of Advanced Materials Sci. Eng., Hanyang University)
  • 원찬호 (한양대학교 부설산업과학연구소) ;
  • ;
  • 안태호 (한양대학교 신소재공학과, 세라믹연구소 국제지속가능공학소재(ISEM)센터)
  • Received : 2015.11.19
  • Accepted : 2015.12.18
  • Published : 2016.02.29
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Abstract

This study investigates the effect of carbon fiber sheet (CFS) and carbon fiber strand sheet (CFSS) on the fatigue resistance and compressive strength of RC slabs. The results of a comparison of the number of equivalent cycles between the CFS- and CFSS-reinforced RC slab test specimens obtained from a fatigue test indicate that the CFSS-reinforced RC slab has 1.2~1.3 times greater effect of reinforcement than the CFS-reinforced RC slab. This study also indicates that the fatigue resistance of the CFS- and CFSS-reinforced RC slabs is ensured when the compressive strength of concrete is not lower than the specified design strength prescribed in the Specifications for Highway Bridges but is not ensured when the compressive strength of concrete is lower than the specified design strength, although the effect of reinforcement is secured.

본 연구에서는 교량의 보강재료로써 주목받고 있으며, 적용이 이루어지고 있는 탄소섬유시트(CFS) 및 새롭게 개발된 탄소섬유스트랜드시트(CFSS)를 이용하여 RC 상판 공시체에 접착보강하고, 보강을 통한 내피로성의 평가 및 RC 상판 공시체의 압축강도가 보강효과에 미치는 영향을 분석하였다. 윤하중 피로 실험을 통해 내피로성을 평가한 결과, 기존의 CFS 전면접착보강 공법에 비해 새롭게 개발된 CFSS 격자접착보강 공법의 보강효과는 1.2~1.3배의 보강효과가 확인되었다. 또한, RC 상판의 압축강도가 보강효과에 미치는 영향을 분석한 결과, 압축강도가 시방서의 설계기준강도 이하일 경우에는 보강 후에도 내피로성은 평가되지 않았다. 따라서, 탄소섬유재료를 이용한 접착보강을 실시할 경우에는 RC 상판의 콘크리트 압축강도 및 사전조사를 실시할 필요가 있는 것을 알 수 있었다.

Keywords

References

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