Seismic behaviour of diaphragm-through bolted-welded joints between CFST column to steel beam

Abstract

A new generation of through-diaphragm bolted-welded joints between narrow cross-section concrete filled steel tube column to H-beam were developed in this paper. In such joints, the welded connection is adopted in the upper flange of the beam, and the bolted connection is still used in bottom flange and web of the beam. The new structures of through-diaphragm bolted-welded joints were mainly used to solve the problems of reserved installation gaps and smaller joint stiffness of through-diaphragm bolted joints proposed by authors previously. To investigate the seismic behaviour of through-diaphragm bolted-welded joints, this paper presents the details of four new experiments. For comparison, both monotonic and hysteretic loading cases were considered in the experiments. The test results show that through-diaphragm bolted-welded joints have larger stiffness, which can be categorized as rigid joints, and they also have good ductility, satisfactory bearing capacity, stable and effective hysteretic behaviour and desirable energy dissipation capacity.