Fire Resistance of Steel Beams Including Beam-Column Welded Connections With Through Diaphragms

Abstract

Main purpose of this study is to clarify both load-bearing and deformation capacity for steel beams including beam-column welded connections at high temperature, by conducting their experiments under a condition on constant temperature and gradually increasing load. The beam-column welded connection with through diaphragms is arranged in the center of beam specimen. The welded connection without scallops in the wide flange beam is used, which is widely used for steel structures in Japan and difficult to occur brittle fracture at severe earthquake. The specimen temperature was gradually risen by an electric furnace, and the shear force was applied after the temperature reached to the test temperature and kept constant it. From minute investigations on the experimental results, it was clarified that all specimens exhibited the beam bending collapse mode and possessed the larger bending strength than the full plastic moment at each temperature. It is expected that the beam-column welded connection with high seismic performance by the non-scallop working also possesses the high load-bearing and deformation capacity at fire.