In this study, finite element analyses were performed on patch repaired thickness-reduced plate under dead load. In the case of re-corrosion of the main plate and sectional reduction of the inside of the patch plate, the mechanical properties of main and patch plates with shared axial forces of thickness-reduced plates were evaluated for corrosion propagation after the repair. As a result, it was clarified that a part of the dead load carried by the main plate is re-distributed to the patch plates when the sectional defect in the main plate is re-corroded, and that is highly dependent on the re-corrosion direction of the main plate. An estimation equation for the dead load redistributed by re-corrosion was derived, and the FEM analysis and the estimation equation showed similar results.
