Effect of Shear Key and U strip on Flexural Behavior of Reinforced Concrete Beams Strengthened by CFS(Carbon Fiber Sheet)

탄소섬유쉬트로 보강된 철근콘크리트 보의 휨거동에 전단키와 U 스터립이 미치는 영향

It is generally known that the bonding strength of RC(Reinforced Concrete) flexural members strengthened by fiber sheet composites are sufficient and the bonding failure does not occur until the sheet failed. However, many researchers have been reported that, before the failure of the sheet, the bonding failure happens even though the bonding length is sufficient. This study was carried out to evaluate the effectiveness of shear key and U strip on flexural behavior of reinforced concrete beam structures. The ply number of CFS(Carbon Fiber Sheet), location of shear key, and existence or not of U strip were selected as the main test variables. Test results show that the behavior of a beam of which shear key is located in the nearby. of support and U strip is not existent, and having CFS of 1 ply is mostly improved.