PLASTIC DEFORMATION CAPACITY AND FRACTURE PREVENT DESIGN OF MOMENT CONNECTION STRENGTHENED BY THICK FLANGE

Abstract

This paper presents the results of full-scale loading tests of beam-to-column subassmblages strengthened by TF (Thick-Flange) connection. TF connection is a moment frame connection with the thickness of the beam flange increased near the connection region to prevent fracture of the welded moment connection and effective to improve workability and quality of the welding. From test results, TF connection successfully avoid fracture initiated from welds and exhibited sufficient deformation capacity. The design method of the tapered thick flange is proposed to prevent a crack at the toe of the weld access hole and to keep the plastic region of the beam away form the welds.