Experimental and Theoretical Investigation on Shear Strengthening of RC Precraced Continuous T-beams Using CFRP Strips

Carbon fiber reinforced polymer (CFRP) sheets are externally bonded to reinforced concrete (RC) members to provide additional strength such as flexural, shear, etc. It has been widely accepted that carbon fiber reinforced polymers (CFRPs) can be used effectively to strengthen reinforced concrete (RC) members. This paper is intended to study and use externally bonded CFRP strips to repair and strengthen of RC continuous T-beams, as well as influence of material (CFRP) on repair of shear defect on RC continuous T-beams. And this defect that will repair by using different CFRP strips under sustained loading. Total of three RC continuous T-beams with identical size of 150x320x3650mm, flange width= 400mm and flange thickness = 120mm, and the orientation will involves 0/90 degree and 45/135 degree in 3 sides wrap schemes All beams will be tested under sustained loading. Tests result shows that the effectiveness and shear capacity of the CFRP strengthened specimens. The shear enhancement of the CFRP strengthened beams varied between 26.57% and 38.56% over the control beam. This study confirms that the CFRP strip technique significantly enhances the shear capacity of reinforced concrete shear beams.