Study On Performance-based Damping Scheme Choosing For The Frame Core-tube Structure Of A Supper High-rise Building In High Seismic Intensity Region

China is a country with frequent earthquakes,and a dense population.Researches on the seismic performances of super high-rise buildings in high-intensity areas has attracted much attention.Based on the frame core tube structure of a super high-rise building in Haikou,this paper discusses the seismic performances and their economical efficiency of different energy dissipation and damping schemes,so as to provide a reference for scheme choosing of any practical projects.Mainly the following works are performed in this paper:(1)Firstly,the energy dissipation and damping technologies of buckling restrained brace(BRB)and viscous damping wall(VDW)are summarized.The research status,structure and working mechanism of BRB are described.The related research situation and basic theory of seismic vulnerability analysis are summarized.The ETABS software and its FNA algorithm are introduced.The calculation method of additional damping ratio of energy dissipation and damping structure is proposed.(2)Combined with an engineering example,the initial seismic model of the frame core tube structure and the calculation models of three energy dissipation and damping schemes(BRB damping scheme,VDW damping scheme,BRB + VDW damping scheme)are established.And the elastic analysis under the frequent earthquake is carried out,and the seismic performance indexes such as base shear,interlayer displacement and displacement angle are obtained,and the comparative analysis is carried out.(3)The nonlinear constitutive and parameters in ETABS software are defined,and then the appropriate seismic wave is selected.The dynamic elastoplastic analysis of the four structural models is carried out under the action of fortification earthquake and rare earthquake respectively.The time history analysis results of energy dissipation,base shear,interlayer displacement,displacement angle and structural damage of each structure are investigated,and the comparative analysis is carried out to explore the damping schemes under medium and large earthquakes energy dissipation and shock absorption effects.(4)The concept of extremely rare earthquake is introduced,and the dynamic elastic-plastic results of the structures under the extremely rare earthquake are compared and analyzed,so as to study the ability of energy dissipation and damping structures of each scheme to resist the extremely rare earthquake,and verify that the energy dissipation and damping structure can improve the seismic performance target of the structure by one level,so as to achieve "great earthquake does not collapse".(5)From the initial cost of the structure and the economic loss after the earthquake,a comparative study is done in this paper that on the economical efficiency of each scheme of the frame core tube structure.Some guidance is given for the scheme choosing of any actual construction design.(6)Finally,the main contents and works of this paper are summarized briefly.Combined with the practical engineering application,some valuable conclusions are drawn,which will have reference to any actual supper high-rise building with a frame core-tube structure in high intensity area when choosing its energy dissipation and shock absorption scheme.