In recent years, the braces and knee braces have been used for a seismic retrofitting in the steel buildings. Also, the reinforcement of sectional area for steel members has been carried out. This paper proposes a new friction-type joint that is required at the time of these reinforcements. It is remarkable advantages of the proposed joint that the joint does not need bolt-holes and welding. Also, the building can be used while retrofitting construction. In this paper, the shear tests and the relaxation tests were carried out in order to confirm the performance for the structural design. And, the fatigue test of steel composite beam having the proposed joint was carried out. Then, the frictional performances for design are made clear.
