Application of Buckling Restrained Braces in Hinge-Connected Concrete Frames for Seismic Retrofitting

Hinge-connected concrete frames are still used in China.The frame is desighed without earthquake resistive consideration.It is necessary to conduct seismic retrofitting to this kind of structure.Buckling restrained braces were developed from steel brace and overcomed the weakness of unstablity of common steel timber. Buckling restrained brace has exact yield displacement and yield load.It can keep elastic under frequently occurred earthquake,and absorb earthquake energy under rare earthquakes.Based on the characteristic of the buckling restrained brace,the method of seismic retrofitting for a practical hinge-connected concrete frame was put forward.And the anargy disapation ability was studied after refrofitting based on this projeet.