Seismic Performance Analysis Of Eccentrically Braced Steel Frame High-Rise Building

The eccentric support structure of high-rise building is a new type of structural system widely used in high-intensity seismic area in recent years.Compared with the steel frame structure,the steel frame structure of eccentric has a large resistance to lateral stiffness and ductility is better;Compared with the center support steel frame structure,their elastic stiffness has little difference,but once the structure into the plastic stage,eccentric support steel frame lateral stiffness decreased slowly,Ductility is better,the overall seismic performance is better than the center support steel frame and can effectively protect the main components such as beam and column security.Based on the previous research on the eccentric support structure,the stress and seismic performance of the eccentrically braced steel frame structure are discussed comprehensively by means of theoretical analysis and finite element analysis.Firstly,the bearing capacity,stiffness and ductility of different eccentrically braced steel frame structures are deduced by using the principle of virtual work,discuss the relationship between them.Then using the finite element software ABAQUS,the forms(D,K,V,etc)of the steel frame structure of eccentric nonlinear finite element analysis,through the contrastive analysis of the stiffness,ductility,etc,Validated the correctness of the theoretical analysis.And then further study the component parameters of K-type eccentric braced steel frame structure with better mechanical performance,though contrast analysis finally conclude the range of parameters for the best performance of the structure.Finally,on the basis of former chapters,The high-rise K-type eccentric support steel frame is established,The supporting arrangement is arranged in both sides and in two forms.Select the structural dimensions and component parameters.Use the finite element software SAP2000 to analyze the time-history analysis.Compared with the top displacement of the seismic wave and the base shear,etc,then get different support layout of the high-rise structure of the system,the middle of the two-span arrangement of K-type eccentric support the overall seismic performance better than other arrangements.