Research On Seismic Performance Of Steel Reinforced Concrete Frame-reinforced Concrete Core Wall Hybrid Structure In High Seismic Intensity Region

Steel Reinforced Concrete(SRC)frame-reinforced concrete core wall hybrid structure exhibits good seismic performance and is widely adopted by tall and super tall structures in high seismic intensity region.Relatively systematic research works on seismic performance this kind of structure are carried out in this paper,which includes:parametric Model for hybrid structures,hysteretic model for SRC frame member and analytical model for core wall,the structure failure mode,cooperative beating and cooperation deformation between substructure,the control design index and simplified design method,etc.The detail research contents and lines in this paper are listed as fellows:(1)Based on existing research results for SRC members,the computing methods of N-M and M_x-M_y curves for compression-flexure SRC members are provided theoretically. And principles are proposed for transforming of member M-φcurve into M-φcurve for plastic hinge.The researches in this paper are very useful for nonlinear analysis of SRC members,and can serve as basis of nonlinear analysis of SRC frame-reinforced concrete core wall hybrid structure.Also,the strong column-weak beam problem of composite frames with steel beams and SRC columns is discussed and some suggestions are proposed to realize this failure mechanism.(2)The ductility of primary lateral resisting member,i.e.Core wall is analyzed using finite element program ADINA.The influencing factors like aspect ratio,concrete grade, axial compression ratio,reinforcement ratio and boundary confinement etc.are considered in the analysis.Based on the mechanical performance of shear walls with large aspect ratio, the parallel multi-component model of shear wall in hybrid structure is determined in combination with finite element program SAP2000.(3)Using nonlinear static analysis method,the failure mode and seismic performance of hybrid structure with various stiffness characteristic valueλand core tube aspect ratio H/b are analyzed,together with the deformation rules and characteristics with the increase of earthquake action.Based on the aforementioned research,some suggestions are proposed for failure mode,core tube aspect ratio H/b,stiffness characteristic valueλand macro-displacement control of hybrid structure.(4)The cooperative work performance of hybrid structure between SRC frame and RC core wall are analyzed,in which shear distribution,overtuming moment distribution, internal force and cross section design of shear walls and flame columns etc.is considered. Based on the mechanical performance of structure and members,some proposals are provided on design parameters like shear bearing ratio of frame,member axial compression ratio and so on.(5)Based on test data for SRC frame,the stiffness degradation model of SRC frame is determined.Combined the model with that of Reinforced Concrete core wall and Reinforced Concrete frame,the response spectrum method based on stiffness degradation is proposed for the three-stage seismic design of frame-core wall structure.The realization step of the means is introduced and verified by a calculation illustration.