Studies On Seismic Behavior Of The Fully-Bolted Through-Diaphragm Connection Between Rectangular Steel Tube Column And H-shaped Steel Beam

Because of its advantages of such as having lightweight and high strength, rapid construction, doing excellently behavior on resisting earthquake and so on, steel structure construction had developed rapidly in our country in recent years. As the key part of the communication of horizontal and vertical component, Beam-column joints have a significant impact on the bearing capacity and seismic behavior of the whole structure. Beam-column joints have become a pop field of research on steel structure. Damage occurred at the beam-to-column connections, and often cracks in beam flanges. In this paper, the fully bolted through-diaphragm connection between rectangular steel tube column and H-shaped steel beam is invented on the bases of previous researches. As the through diaphragm connection with fully-bolted methodology is not mentioned in the design code of steel structure in China, and the purpose is to study the fully bolted diaphragm-through connection and obtain enough structural design information, finite element numerical analysis were carried out in this paper.Using the software ANSYS finite element analysis, elastic-plastic analysis on the fully-bolted through-diaphragm connection between rectangular steel tube column and H-shaped steel beam under vertical and circling load was conducted. Considering the change of the thickness of the diaphragm, the extended length of diaphragm, thickness of junction plates of the fully bolted through-diaphragm connection joint was systematically studied in this paper. Results showed that: ductility coefficient is not less than 4, and the viscous damping coefficient ranges from 0.27 to 0.48, the fully bolted through-diaphragm connection joints have good ductility and good energy dissipation performance. The larger part of the stress is in the root of the diaphragm and the area where bolts connect diaphragm and beam. The plastic hinge occurs at the flange of the beam, close to the end of the extended diaphragm, which meets the design requirements. The thickness of the diaphragm should be enough and it is recommended be larger at least 2mm than the thickness of the flange of beam to ensure the reliability of the connection. The extended length of diaphragm is recommended between 30 mm to 80 mm. The thickness of the junction plate has little influence on the performance of the joints, and it is suggested 2mm to 8mm larger than the thickness of the steel beam web.