Research On Seismic Collapse Performance Of Self-centering Steel Reinforced Concrete Wall Panels With Energ Dissipation Devices In Steel Moment Frames

Steel frame-self-centering steel reinforced concrete wall panels with replaceable energy dissipation devices is a new fabricated structural system with double lateral force resistance,which is composed of self-centering panels,post-tensioning tendons,energy dissipation devices and steel frames.In addition,it has excellent ductility,excellent energy dissipation and good recoverable functionality.Although the SF-SSW structure can reduce the inter-story displacement and residual deformation under earthquake and improve the seismic performance of the structure,its collapse and damage under a major earthquake is not yet known.The building structure needs to have sufficient anti-collapse safety reserves to prevent the structure from collapsing and destroying under a major earthquake.Therefore,this paper evaluated the seismic collapse resistance of the SF-SSW structural system and carried out related research,including structural influence coefficient,displacement amplification coefficient,and structural vulnerability analysis.The main work is as follows:(1)Based on the low-cycle repeated loading test of the self-resetting SRC wallboard substructure of the research group,this paper established the finite element analysis model about SSW structure by using SAP2000.On the basis of verifying the feasibility of the substructure model,the linear analysis model of the multi-story SF-SSW structure system was proposed in this paper.The SF-SSW structure model with six and fifteen floors was designed according to Chinese codes,and the structural rationality was checked through response spectrum analysis.The results showed that its internal force distribution,shear-weight ratio and maximum inter-story displacement angle meet the requirements of the codes.(2)Pushover and IDA analysis were carried out on the six-layer and fifteen-layer SF-SSW structure respectively.And the base shear force and vertex displacement curves of the structure were obtained.The high-order mode shape was converted into a capacity spectrum curve which intersected with demand spectrum of different ductility to obtain the performance points of the SF-SSW structure under fortification and rare earthquakes.On basis of this,the recommended values of the overall seismic performance parameters were put forward.At the same time,the dynamic response characteristics of SF-SSW under different seismic intensities were analyzed.(3)According to the suggested value of structure influence coefficient R given in the article,the six-story and fifteen-story SF-SSW structure models were designed.IDA analysis was performed and the vulnerability curve described based on Sa(T1,3.5%)was drawn.The collapse margin was obtained and the collapse resistance performance of the structure was evaluated based on the seismic collapse evaluation system of FEMAP695.The results show that the SF-SSW structure designed according to the recommended value of R has a collapse probability of less than 10% under a large earthquake and meets the seismic requirements of "no collapse in a large earthquake".Besides,it has sufficient safety reserves.The results indicate that the proposed value R in this article is reasonable.Based on the above research,the anti-seismic collapse performance of SF-SSW is discussed,and the rationality of the suggested value of the structural influence coefficient given in this paper is evaluated,which provides a reference for the subsequent seismic design and application promotion of the structure.