Epoxy resin is used for making the contact surface smooth when repairing or reinforcing steel bridge members by high strength bolted frictional joints. The load transferring mechanism of the joints where both high strength bolts and epoxy resin are utilized is unclear. Since the strength of cohesive failure of the inorganic zinc-rich paint is smaller than that of the joints of the adhesive, a reinforcing of inorganic zinc-rich paint is very effective measure by filling the air gap of inorganic zinc-rich paint. The tensile test for such joints has been conducted in order to investigate improving slip strength by using a primer and an adhesive, the timing of tightening and the bolt axial force.
