| Beam-column joint plays a key role in transferring moments and shearing forces between beam and column, and its performance has an important effect on the stability, stiffness and bearing capacity of structures. In general, the energy dissipation in steel structures are provided by the plastic hinges generated at beam ends, and the joints can always display excellent seismic performance in laboratory, however, the damage of joints are still unavoidable in practice, leading to great difficulty and high cost in repairing them. With the development of behaviour-based seismic design conception, new-type beam-column joints with self-centering and/or easy-repairing characteristics have been focused by many engineers and researchers.A new-type beam-column joint dissipating seismic energy via the friction between its different components with relative rotation is proposed in present study, where relative rotation between the beam and column will be generated once the end moment of beam overpasses a prescribed value under severe seismic action, resulting in the internal force redistributing in structures to keep all members and joints in an elastic state, meanwhile, seismic energy in structures can be dissipated through the friction between different components of the new-type beam-column joint, furthermore, the structure can be restored by adjusting the prestressing force in high-strength friction bolt and exerting extra tensile force in the diagonal direction of the frame after the earthquake.Push-over method and time-history method are adopted respectively in seismic analyses of steel structures employing the new-type beam-column joints with SAP2000. For comparison reason, the corresponding steel structural models employing traditional beam-column joints are also analyzed. Regular frame structures and irregular frame structure were built in Push-over analysis, using two load patterns with displacement control. While in dynamic analysis, two steel frame structures with different heights and one regular, one irregular steel frame structures were built. Three kinds of the earthquake waves were adopted in present study, EI-Centro wave, Taft wave and Artificial wave. Meanwhile, this paper analysises the seismic behavior of the arrangement numbers and the initial rotating friction moment of the new-type beam-column joint. Compared with normal framework, Dynamic analysis results shows that when the value of the initial rotating friction moment of the new-type beam-column joint take0.6times of the value of Beam end yield moment, the maximum vertex displacement in12layers of regular framework armed with the new beam-column joint can be reduced by up to29.8%, the displacement of weak layer can be reduced by up to23.3%, the maximum shear force in the bottom layer can be reduced by up to19.8%; while in16layers of regular framework armed with the new beam-column joint, when the value of the initial rotating friction moment of the new-type beam-column joint take0.6times of the value of Beam end yield moment, the maximum vertex displacement can be reduced by up to22.7%, the displacement of weak layer can be reduced by up to13.9%, the maximum shear force in the bottom layer can be reduced by up to19.4%; in16layers of vertical irregular framework armed with the new beam-column joint, when the value of the initial rotating friction moment of the new-type beam-column joint take0.6times of the value of Beam end yield moment, the maximum vertex displacement can be reduced by up to27.3%, the displacement of weak layer can be reduced by up to24.3%, the maximum shear force in the bottom layer can be reduced by up to19.5%; in12layers of irregular plan framework armed with the new beam-column joint, when the value of the initial rotating friction moment of the new-type beam-column joint take0.6times of the value of Beam end yield moment, the maximum vertex displacement can be reduced by up to19.9%, the displacement of weak layer can be reduced by up to22.3%, the maximum shear force in the bottom layer can be reduced by up to25.5%. |
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