MECHANICAL BEHAVIOR OF CFRP BONDED REPAIR OF THICKNESS-REDUCED STEEL PLATE UNDER PURE BENDING

Many research reports on bonded repair and reinforcement using carbon fiber reinforced polymer (CFRP) for steel structures deteriorated by corrosion are published. So far, it was already clarified that the that the stress assuming the composite theory of the thickness-reduced plate and CFRP does not agree with the finite element (FE) analysis and the shear lag theory under the axial force. However, the shear lag theory has not been investigated for CFRP bonded repaired steel plates subjected to bending moment. In this study, shear lag theory and FE analysis were carried out for the CFRP bonded repair of the thickness-reduced plate under pure bending, and the mechanical behaviors were clarified. As the results, it was shown that the sectional forces calculated by the composite theory of thickness-reduced plate and CFRP do not correspond with that given by the FE results and shear lag theory depending on the dimensions of defect and thickness of CFRP under the pure bending condition, even if the bonded length of CFRP was sufficient.