Analysis of Damping Effect of Buckling Restraining Brace in Super High-rise Steel-concrete Hybrid Structures

The buckling restraining brace has two kinds:load bearing brace and energy dissipation brace. Whether the damper starts working subjected to seismic action is an important standard to distinguish the two.Energy start bearing capacity is the key to decide its energy dissipation.By a finite element analysis software to BRB-Structure,based on elastic internal forces of the brace under the frequent earthquakes,the bearing capacity of energy dissipation brace under the action of earthquakes is designed.Three seismic waves(EL-centro,Taft and artificial wave)and time history analysis method are used in working conditions of small,moderate and major earthquakes to analyze the energy dissipation.The results show that, BRB keeps elastic and it provides the structure enough stiffness under small earthquakes;it can start to dissipate the energy under moderate earthquakes and so protect the main structure effectively.With the energy dissipation brace and the main structure working together,it can protect the main structure from collapsing.