ABSTRACT
Few theoretical studies have been conducted on carbon fiber-reinforced polymer (CFRP)-bonded steel tubes. However, for the repair and reinforcement of the base of signposts and light poles, the authors consider that the shear lag theory and energy release rate at debonding for CFRP-bonded steel tubes subjected to bending moments are necessary. In this study, the stresses in CFRP-bonded steel tubes under pure bending conditions are derived by applying the shear-lag theory. Additionally, equations for calculating the required bonded length and energy release for CFRP-bonded steel tubes were provided. The stresses in the steel tube and CFRP derived in this study were in close agreement with the axial stress components obtained from linear finite element analysis. The shear stress distribution in the adhesive also exhibited a trend similar to that of the analytical values. The energy release rate also agreed well with the results of linear finite element analysis.
