| Seismic design of structures generally adopts two ways:active or passive control. The Active control systems’damping and forced vibration’effect is better, but need special monitoring and control system, which are complex and high cost, to support. While, passive control systems don’t need special monitoring system to support, they consume the seismic energy by using secondary components’yield and the friction between the plates with simple principle and low cost, these systems are wildly used in civil engineering.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 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.The new-type beam-column joints are arranged into a series of regular and irregular high-rise X-shape braced steel frame models, and these models are analyzed by using the engineering software SAP2000, meanwhile, this paper analyzes the seismic behavior of the initial rotating friction moment of the new-type beam-column joint. Under the action of El-Centro wave and Taft wave, the dynamic analysis presents that the new-type beam-column joint has much better performance in resisting severe seismic actions. When the initial rotating friction moment of the new-type beam-column joint set as0.6times of the elastic limit bending moment of beam, compared with normal20-storey regular X-shape braced steel frame, the interlayer displacement angle of weak layer in regular20-storey X-shape braced steel frame with new-type beam-column joint can be reduced by up to8.16%, the interlaminar shear can be reduced by up to26.92%, the displacement of top layer can be reduced by up to5.59%, the shear force in the bottom layer can be reduced by up to6.29%; compared with normal30-storey regular X-shape braced steel frame, the interlayer displacement angle of weak layer in regular30-storey X-shape braced steel frame with new-type beam-column joint can be reduced by up to9.18%, the interlaminar shear can be reduced by up to23.03%, the displacement of top layer can be reduced by up to11.59%, the shear force in the bottom layer can be reduced by up to5.3%; compared with normal40-storey regular X-shape braced steel frame, the interlayer displacement angle of weak layer in regular40-storey X-shape braced steel frame with new-type beam-column joint can be reduced by up to49.70%, the interlaminar shear can be reduced by up to72.23%, the displacement of top layer can be reduced by up to53.77%, the shear force in the bottom layer can be reduced by up to40.91%. For two irregular X-shape braced steel frame models with new-type beam-column joints, compared with normal30-storey irregular plane X-shape braced steel frame, the interlayer displacement angle of weak layer in30-storey irregular plane X-shape braced steel frame with new-type beam-column joint can be reduced by up to16.02%, the interlaminar shear can be reduced by up to30.1%, the displacement of top layer can be reduced by up to14.85%, the shear force in the bottom layer can be reduced by up to8.39%; compared with normal30-storey vertical irregular X-shape braced steel frame, the interlayer displacement angle of weak layer in30-storey vertical irregular X-shape braced steel frame with new-type beam-column joint can be reduced by up to7.38%, the interlaminar shear can be reduced by up to22.33%, the displacement of top layer can be reduced by up to8.04%, the shear force in the bottom layer can be reduced by up to7.23%.This paper also analyzes the impact of the seismic performance of the different layout scheme of new-type beam-column joint different layout scheme, under rare earthquake. Under the action of El-Centro wave and Taft wave, the dynamic analysis presents that the new-type beam-column joint has much better performance in resisting severe seismic actions, all floor layout new-type beam-column joint is the best scheme for structural seismic. Normal40-storey regular X-shape braced steel frame under rare earthquake waves, compare to all floor layout new-type beam-column joint scheme, the distribution of plastic hinge centralized floors arranged new-type beam-column joints has the larger interlayer displacement angle, but the floor without new-type beam-column joint can decrease the interlayer displacement angle. Normal30-storey vertical irregular X-shape braced steel frame under rare earthquake waves, the distribution of plastic hinge centralized floors arranged new-type beam-column joints almost has the same seismic performance as the all floor layout new-type beam-column joint scheme. Above all, all floor layout new-type beam-column joint has the best seismic performance; the distribution of plastic hinge centralized floors arranged new-type beam-column joints can get a better seismic performance and get better economy. This paper also analysis the seismic behavior of the initial rotating friction moment of the new-type beam-column joint. |
PDF Full Text Request