Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Bond Characteristic Between Lightweight Concrete and GFRP Bar

경량콘크리트와 GFRP 보강근의 부착 특성

  • Received : 2013.03.19
  • Accepted : 2013.08.07
  • Published : 2013.11.30
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Abstract

FRP reinforced lightweight concrete structures can offer corrosion resistance and weight reduction effect simultaneously, so practical use of the structures may be expected afterwards. But to make concrete structures using lightweight concrete and FRP bar, that can resist external forces without internal slip of the FRP bar, it is very important to understand bond characteristic between lightweight concrete and FRP bar. During that time, a lot of studies for bond behaviors of FRP bar in normal concrete were conducted, but studies for bond behavior of FRP bar in lightweight concrete are very limited to date. So, bond characteristic between lightweight concrete and helically deformed GFRP bar was investigated in this study. Three main parameters were considered in experimental investigation: type of rebar, concrete type, and compressive strength of lightweight concrete. As an experimental result, it could be known that bond strength of helically deformed GFRP bar in lightweight concrete was 0.49 times bond strength of steel reinforcement in normal concrete.

FRP 보강근을 사용한 경량콘크리트 구조체는 부식방지 및 자중감소의 효과를 동시에 기할 수 있는 이점이 있어서 추후 그 활용이 기대될 수 있다. 그러나 경량콘크리트와 FRP 보강근을 사용하여 보강근의 내부슬립 없이 외력에 저항할 수 있는 구조체를 만들기 위해서는 경량콘크리트와 FRP 보강근 사이의 부착특성을 파악하는 것이 대단히 중요하다. 그동안 보통콘크리트와 FRP 보강근 사이의 부착거동에 대하여는 많은 연구가 있어 왔으나 경량콘크리트와 FRP 보강근 사이의 부착거동에 대하여는 현재까지 연구결과가 대단히 부족한 실정이다. 따라서 본 연구에서는 경량콘크리트와 보강근 표면에 나선형태의 이형을 갖는 GFRP 보강근 사이의 부착특성을 조사하였다. 비교목적으로 보강근 종류, 콘크리트 종류, 경량콘크리트 강도종류의 실험변수를 고려하여 인발실험체들을 제작하고 실험을 행하였다. 실험분석 결과, 보통콘크리트와 철근을 사용한 실험체의 부착강도를 1.0으로 하였을 때 경량콘크리트와 나선형태의 이형을 갖는 GFRP 보강근을 사용한 실험체의 부착강도는 0.49로 나타났다.

Keywords

References

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