Repairing Method for Steel Member with Cross Section Loss by CFRP Bonding

Abstract

<p>As a repairing method for corroded steel members, a method to bond the carbon fiber sheets with resin to the steel member had been developed. Commonly, the carbon fiber sheet having the tensile stiffness equal to or greater than that of the cross-section loss is bonded to the steel member.</p><p>However, in the case of such repairing method, it have been reported that the reinforcing effect may be not sufficient. In this study, a new repairing method was proposed for the steel member having cross-section defects. In new design method, the carbon fiber sheets having the tensile stiffness of the inverse number times of the residual ratio of the defect parts of steel are bonded. In order to confirm the validity of the proposed method, the tensile test and the numerical analysis were carried out. The result showed that the tensile stiffness at the cross-section defect part is recovered to equal to or greater than the original tensile stiffness by bonding the carbon fiber sheet.</p>