Seismic performance analysis of the composite frame with buckling-restrained brace

The finite element model based on ANSYS for concrete-filled steel tube column was put forward, which was verified that the model can be used to simulate accurately the seismic performance of concrete-filled steel tubular column. The plastic developing theory of the composite frame with Buckling-Restrained Braces (BRB) in the process of Pushover was researched, and the principle to work together of the structure under earthquake was analyzed. The influence of the yield strength of inner core of BRB and the stiffness ratio of BRB to frame on seismic performance of structure was analyzed. The seismic performance of the Composite Frame with Buckling-Restrained Brace is good, the earthquake energy dissipation is completed when BRBs yield firstly, the mail frame will be protected, and the seismic responses of the structure will be reduced. The yield strength of inner core should be confirmed according to the seismic response of structure under future earthquake. When the stiffness of BRB to frame is ensured as 3-5, the seismic performance of structure is better and the structural design is more reasonable.