Seismic Resistance,Wind Resistance And Design Method Of Viscous-Elastic Buckling-Restrained Brace

When subjected to moderate or strong earthquakes,the buckling-restrained brace (BRB) can absorb energy from seismic wave to reduce the damage of the main structure.But the BRB can only provide lateral stiffness as conventional brace when subjected to minor earthquakes and wind vibration.Viscous-elastic damper(VED) can sufficiently make up the shortage.This paper introduces an innovative Viscous-elastic buckling-restrained brace(VE-BRB) which combine VED and BRB in parallel.It offers a new option to the design of anti-seismic and wind resistance. When subjected to moderate or strong earthquakes,BRB works with VED to absorb energy.In this thesis.Design procedures and design proposal for this brace are preliminary proposed. The seismic performance and wind-resistance performance of the VE-BRB are analyzed.The main contents are as follows:1)The theories and design procedures of buckling-restrained brace and viscoelastic damper were summarized.On this basis,the design procedures of VE-BRB was preliminary proposed, including global stability,local stability,local stability of the core and width of the gap.2)The parameter analysis which influence the seismic performance of buckling restrained brace frame is done.Results show great influence is the lateral stiffness ratio while the.proportion of the length of collapse region to the length of total line.The smaller the object’s mass, and the greater its area, the more it will slow.For the larger the lateral stiffness,the story drift will smaller.And the downward of the story drift will slow down, when the lateral stiffness reach a critical value.3)The seismic performance and wind-resistance performance in structure is carried out by finite element simulation by SAP2000. Results are as follows:In rare earthquake,the base shear and the roof acceleration of the VE-BRB frame change smaller while the story drift increased compared with the BRBF.The base shear,the roof displacement and story drift are all reduced under high wind speed compared with the BRBF.