Research On Design Method Of Metal Energy Dissipation And Shock Absorption Structure

China is one of the countries with high incidence of earthquakes all over the world.Earthquakes have caused a large number of buildings to be destroyed and made the structure lose its bearing capacity.The traditional seismic design is to increase the size of the cross-section of the structure,increase the reinforcement ratio,and improve the strength of the material,which is actually a "hard" method.With more and more irregular buildings and super high-rise buildings,this "hard resistance" method may lead to greater seismic effect.Energy dissipation and shock absorption technology is a passive control technology.It can protect the main structure by dissipating the energy input from earthquake,so that the main structure can keep elastic state or provide multiple lines of defense for it.Metal dampers have natural advantages and good hysteretic performance.The metal dampers introduced in this paper have buckling restrained braces and metal shear dampers.The buckling restrained braces are simple in structure.By the buckling restrained structure design,the common braces have the same ultimate tension and compression force.They not only provide the main structure with greater lateral stiffness,but also have the function of energy dissipation and vibration reduction.The metal shear damper can produce the metal yield energy dissipation in-plane by limiting the out-of-plane buckling structure design of the metal plate,thus providing the main structure with energy dissipation.Two seismic lines of defense.With the development of energy dissipation technology,more and more practical projects will adopt the seismic design idea of energy dissipation.The current Code for Seismic Design of Buildings(GB50011-2010)has made clear the design requirements of energy dissipation structures.In the first chapter of this paper,the research status at home and abroad is summarized,the design ideas of metal energy dissipation and shock absorption in YJK and ETABS are put forward,and the feasible technical route is worked out.In the second chapter,the basic principle of energy dissipation is introduced,and then the structures and hysteresis of buckling restrained braces and shear dampers are described in detail.Finally,the common connection modes between dampers and frames are summarized.In the third chapter,the energy dissipation structure is taken as the research object and the double-folded line model is taken as the theoretical basis.The commonly used analysis methods of energy dissipation structure are elaborated in detail.In the elastic state,the mode decomposition response spectrum method based on linear equivalence is generally used for calculation and analysis,and in the elasticplastic state,the time history analysis is generally used for calculation and analysis.Chapter 4 introduces the design process of buckling restrained braces and metal shear dampers in common design software YJK and ETABS,carries out elastic analysis of shock absorber structures in YJK and elastic-plastic analysis of shock absorber structures in ETABS,and obtains the advantages of energy dissipation and shock absorber structures compared with traditional structures through analysis of design results.In the fifth chapter,based on the overall index of structural design,the scope of application of displacement dampers is expounded.In the case of insufficient lateral stiffness of structures or excessive displacement caused by torsional effect of structures,displacement dampers have better effect.