Shear Strengthening and Repairing of Reinforced Concrete T Beam Exposed to high Temperature Using Near Surface Mounted Carbon Fiber Reinforced Polymers Ropes
Abstract
Strengthening and repairing of shear deficient T-beams subjected to high temperature is limited. This research investigates experimentally the strengthening and repairing of reinforced concrete (RC) T-beams using Near Surface Mounted Carbon fiber reinforced polymers (NSM-CFRP) ropes. In this study eight RC T-beams with shear deficient were cast. Four beams were strengthened using NSM-CFRP ropes with different configurations. Another four beam were subjected to high temperature (650oC) and then were repaired using NSM-CFRP rope. The experimental results showed that using different NSM-CFRP ropes in various configurations effectively improved the shear capacity of RC T-beams. Compared to the control beam, the three groups (Full circulation, 45o inclined and U-Wrapped (bottom and the two sides)) chosen to strengthen the shear of RC T-beams were successful in increasing the maximum load capacity. The U-Wrapped of the CFRP ropes schemes recorded the highest enhancement in the shear capacity with an enhancement ratio of 37% for the non-heated beam with 100 mm spacing and by a ratio of 26% for the heated beam with 100 mm spacing.