Bond-Deteriorated Reinforcement in Concrete Beams Strengthened with CFRP

Presented By: Riyad Aboutaha, Syracuse University
Reinforcement corrosion is one of the most commonly occurring problems that negatively affect the performance of reinforced concrete (RC) structures. For RC beams, corrosion of reinforcement often leads to deterioration of bond between main tensile reinforcement and concrete. There are many ways to rehabilitate bond-deteriorated RC beams. Techniques utilizing carbon fiber reinforced polymers (CFRP) are often adopted due to its properties of lightweight, high strength and corrosion resistance. The objective of this study is to examine the effect of CFRP on the performance of bond-deteriorated RC beams using the finite element analysis (FEA) software ABAQUS to simulate the actual experiment. The results show that the unbonded length of main tensile reinforcement and the thickness of CFRP have a significant effect on the ultimate flexural strength of RC beams. Although the increasing of unbonded length reduce the ultimate load and stiffness of RC beams, using CFRP at the bottom contributes markedly to increasing ultimate load and stiffness of bond-deteriorated RC beams. These simulation results will play an important role in the future research of CFRP strengthening technology.