CFRP 보강근 보강 콘크리트 슬래브 휨설계의 효율성에 관한 연구
Investigation for the Efficiency in Flexural Design of CFRP Bar-Reinforced Concrete Slab
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초록
이 연구에서는 일방향 콘크리트 슬래브를 대상으로 하여, 철근을 사용한 경우와 CFRP 보강근을 사용한 경우에 대해 보강근 사용량에 따른 휨강도와 처짐 및 균열폭을 비교하여 평가하였으며, CFRP 보강근 콘크리트 슬래브의 휨설계의 지배적인 성능과 효율적인 휨설계 방안에 대해 검토하였다. CFRP 보강근을 사용한 콘크리트 슬래브는 철근을 사용한 경우에 비해 동일한 보강근량에서 더 큰 설계휨강도를 얻을 수 있는 반면, 처짐 및 균열폭은 상대적으로 훨씬 크게 발생한다. CFRP 보강근을 사용한 콘크리트 슬래브에서는 최대균열폭이 설계의 지배적인 요인으로 작용하는 것으로 확인하였으며, 효율적 휨설계를 위해서는 허용균열폭을 0.7mm로 완화하여 적용할 필요가 있으며, 작은 직경의 보강근 적용을 검토할 필요가 있음을 제시하였다.
Abstract
In this study, for one-way concrete slabs, the flexural strength, deflection, and crack width according to the amount of reinforcing bars were compared for the cases of using steel reinforcing bars and CFRP reinforcing bars. Critical performance dominating the flexural design was investigated and how to design the CFRP-reinforced concrete slab with efficiency was also discussed. It was found that CFRP-reinforced concrete slabs could achieve greater design flexural strength with the same amount of reinforcing bars compared to those using steel rebar, while deflection and crack width were relatively much larger. In concrete slabs using CFRP reinforcing bars, it was confirmed that the maximum crack width acts as a dominant factor in the design. For more efficient flexural design, it is necessary to mitigate the allowable crack width to 0.7 mm and to apply smaller diameter reinforcing bars to control the crack width.
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