| With the development of society and the improvement of science and technology,the height of super high-rise buildings is constantly breaking through.The structural forms of super high-rise buildings are different,but in the analysis of super high-rise structures with different structural systems,the study of seismic performance becomes a necessary subject.Based on reasonable performance-based design objectives and appropriate anti-seismic structural measures,the structure can meet the requirements of performance-based design and ensure the safety of the structure system under the earthquake.In this paper,the super-high-rise concrete filled rectangular steel tube frame-reinforced concrete core tube hybrid structure(Dalian Renewable Resources Exchange Project)is taken as the research object,according to the 《Technical Specification for Concrete Structures of High-rise Buildings 》(JGJ3-2010),the 《 Code for Seismic Design of Buildings" 》(GB50011-2010)and the relevant review of super-high-rise building engineering.Requirements,reasonable setting of the seismic performance objectives of the structure system,the seismic performance of the hybrid structure and structural design methods are studied,the main work is as follows:1.Two software of different mechanical models are used to the calculation and analysis of rectangular concrete filled steel tube frame-reinforced concrete core tube hybrid structure,namely PKPM software developed by China Academy of Building Research and ETABS software.The calculation results of the structure under the mode decomposition reaction spectrum are obtained.The elastic time-history analysis of the mixed structure system is carried out by selecting appropriate seismic waves,and the envelope design of the reaction of the hybrid structure system under earthquake action is carried out.Based on the above analysis results,the buckling brace is used for the hybrid structure to design the damping energy consumption to ensure the ductility of the structure under the earthquake.2.The finite element analysis of the important nodes of the conversion layer in the hybrid structure is carried out by ANSYS software to ensure the bearing capacity and elastic working state of the node.In order to ensure the safety of the structural system,only the steel component is considered and the concrete is neglected.The analysis results show that the node meets the seismic performance requirements of the seismic fortification.3.The elasto-plastic analysis program EPDA/PUSH of high-rise building structure compiled by China Academy of Building Research is used to analyze the hybrid structure system under earthquake.The elastic CQC seismic force is applied in both X and Y direction,and the nonlinear equations of the structural system are solved by the arc length increment method.The analysis results show that the capacity curve of the structure can pass through the demand spectrum curve under the action of large earthquakes,indicating that the hybrid structure system is safe under the action of large earthquakes and can achieve the seismic performance target.At the same time,combined with the results of elasto-plastic analysis,the weak parts of the hybrid structure are appropriately strengthened by seismic measures,which provide a reasonable theoretical basis for seismic design of similar projects.4.The elasto-plastic dynamic analysis of the hybrid structure was carried out using PERFORM-3D three-dimensional structural nonlinear analysis and performance evaluation software,and the seismic wave was applied to the structural system according to the duration.The elasto-plastic response of the structure corresponding to the ground motion acceleration is obtained by the stepwise integration method.The energy dissipation distribution,the yield energy dissipation mechanism and the plastic hinge distribution of the structural system are obtained.The seismic performance of the super high-rise structural system is evaluated. |
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