Experimental study of through diaphragm bolted joint between H-beam to CFST column

Abstract To avoid the welding difficulties commonly encountered in traditional inner diaphragm joint, the excessive space occupancy of external diaphragm joint and the exposed corner in door caused by the large cross-section width of the column, two types of through diaphragm bolted joints (TDBJs) with narrow cross-section CFST column were proposed. The structural details, assembly process, design principle, theoretical assumptions of the two TDBJs were reported. Two vertical through diaphragm bolted joints (V-TDBJs) and two horizontal through diaphragm bolted joints (H-TDBJs) specimens were designed for the monotonic and hysteretic loading tests, and the ductility, rotation capacity, hysteretic curves, skeleton curves, energy dissipation capacity of the two TDBJs were studied based on the experimental results, and it is showed that the two proposed TDBJs both have the merits of excellent bearing capacity, appreciable ductility, stable and effective hysteretic performance and energy dissipation capacity and ease of fabrication. All the tested specimens can be classified as semi-rigid joints and the loading processes of the two TDBJs can be divided into elastic stage, sliding stage, hardening stage and failure stage.