Strengthening Performance and Failure Characteristics of Reinforced Concrete Beams Exposed to Freezing-and-thawing Cycles after Shear Strengthening with CFRP Plate

CFRP 판으로 전단 보강된 이후 동결융해에 노출된 철근콘크리트 보의 보강성능 및 파괴특성

CFRP plates has been established as an effective method for rehabilitation and strengthening of concrete structures. The CFRP reinforcements are bonded to beams and slabs using structural adhesives. Adhesive strength can be affected by environmental exposure. During freezing-and-thawing cycling, temperature-induced stresses in the adhesive layer, due to differential thermal expansion between the CFRP and the substrate concrete, may lead to bond damage and contribute to or cause premature CFRP composite separation. This paper presents the results of experimental program undertaken to investigate the effects of freeze-thaw cycling (from -18 to $4^{\circ}C$) on the behavior and failure characteristics of RC beams strengthened in shear with CFRP plate using acoustic emission (AE) technique.