ABSTRACT
CFRP bonded repair is the one of the repair methods for corroded steel structures. The workability of this method is better than the conventional steel patch repairs. Therefore, this method is sometimes applied for deteriorated sign posts and lighting columns. However, the debonding of CFRP from adhesive ends is one of the concerns about the CFRP bonded repair. To prevent the debonding of CFRP in the repair design, the shear stress or energy release rate in the adhesive layer is applied to the design verification in Japan. In this study, to evaluate the shear stress in adhesive layer, the shear-lag theory was applied to the steel tubes repaired by partially bonding CFRP subjected to bending moment. Additionally, the shear-lag theory of multiple bonded CFRP partially was also derived for the repair of the steel tubes under bending moment. Then, finite element analysis was performed to confirm the validity of the derived equations.
