스터럽이 없는 GFRP 보강근 콘크리트 보에 대한 실험적 연구
Experimental Study for GFRP Reinforced Concrete Beams without Stirrups
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초록
본 연구에서는 GFRP 이형 보강근으로 휨보강된 보의 거동, 파괴유형과 강도를 평가하였다. 4개의 보 실험체들을 제작하여 실험을 수행하였다. 4점 하중재하 조건으로 단순지지된 GFRP로 보강 콘크리트 실험체의 거동과 하중-처짐을 관찰하였다. 전단배근으로 인한 거동의불확실성을 배제하기 위하여 스터럽을 배근하지 않고 실험체를 제작하였다. 실험 변수는 전단지간비와 유효보강비이다. 실험체의 길이는3,300 또는 1,950mm × 200mm × 240mm이고 순지간 2,900 또는 1,000mm이다. 전단지간비는 6.5와 2.5이며, GFRP 유효 보강근비는1.126ρfb, 2.250ρfb, 3.375ρfb와 0.634ρfb이다. 실험 결과 모든 실험체는 전단파괴 되었으며 실험계획에 적용한 ACI 440.1R, CSA S806와 ISIS의 전단 강도식이 실제와 편차가 있음을 확인하였다.
Abstract
This paper evaluates the shear strength, behavior and failure mode of reinforced concrete beams with deformed GFRPreinforcing bar. Four concrete beam specimens were constructed and tested. It was carried out to observe failure behavior andload-deflection of simply supported concrete beams subjected to four-point monotonic loading. In order to eliminate of theuncertainty by the shear reinforcements, any stirrups were not used. Variables of the specimens were shear span-depth ratio,effective reinforcement ratio. The dimensions of specimen is 3,300 or 1,950mm × 200mm × 240mm. Clear span and shear spanwere 2,900mm, 1,000mm respectively. Shear span-depth ratios were 6.5 and 2.5. Effective ratios of Longitudinal GFRP reinforcingbar were 1.126ρfb, 2.250ρfb, 3.375ρfb and 0.634ρfb. All beam specimens were broken by diagonal-tension shear and the ACI440.1R, CSA S806 and ISIS, which was used to design test beams, showed considerable deviation between prediction and testresults of shear strengths.
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