抄録
Recently, damage to steel truss bridges due to corrosion has become a serious problem worldwide. In particular, severe damage due to corrosion at gusset plate connection is being widely reported. Corroded gusset plates that have reduced load-carrying capacity can lead to the collapse of the entire bridge. Attachment of stiffening plate and member replacement are among the conventional methods often applied to repair corroded structures. However, these repair works lack efficacy because of the heavy machinery and welding facilities required. In this study, two carbon fiber-reinforced polymers (CFRP) bonding methods, outside bonding and both-sides bonding, are proposed to improve the strength of the corroded gusset plate connection and decrease stress on the corroded section of the gusset plate. CFRP is used as the repair material for the corroded gusset plate connection in the proposed methods because of its light weight, high strength, and superior durability. Loading tests were conducted with a model approximately 50% the size of a real bridge and degrees of corrosion assumed to be approximately 50% and 75% of the gusset plate thickness.
