Carbon fiber reinforced plastic (CFRP) bonding has been applied to corrosion- damaged steel members subjected to compression. Uniaxial compression tests and eigenvalue analysis of specimens with CFRP bonded to intact steel plates have confirmed the strengthening effect of CFRP bonding. However, there is no method for estimating the elastic buckling load of CFRP bonded to a cross-sectional defective steel plate with elastic putty. Therefore, this study proposes a method to estimate the elastic buckling load of CFRP-bonded steel plates with cross-sectional defects. The proposed method was in good agreement with the eigenvalue analysis using the finite element method and the maximum load in uniaxial compression tests.
