REPAIR METHOD FOR STEEL GIRDER BY BONDING CARBON FIBER SHEET USING HIGH ELONGATION ELASTIC PUTTY

Abstract

 In general, steel structures have been corroded locally due to water leakage and so on. In particular, although it is obvious that corrosion at steel girder ends results from water leakage through expansion joints, water leakage from drainage system or cracks in a slab and scattering of de-icing salts also corrode members in steel structures. Application of repair method using CFRP sheet to corroded steel structures have been limited so far since delamination under high stress level or buckling deformation is concerned. As a result, there have been a lot of cases to be difficult to adopt this method for various kind of corrosions. Therefore, we propose a new design method corresponding to the characteristics of steel members and structural details. Herein, low elastic modulus and high elongation putty layer is inserted between the steel member and the first CFRP layer to prevent delamination of CFRP sheet. This paper describes a new repair method and its validation through experiments and analyses.