Studies on Cyclic Tests of Assembly CFST Composite Frames With BRB

ABSTRACT CFST (concrete‐filled steel tube) combines the advantages of steel and concrete, and has multiple advantages such as high bearing capacity, good ductility and excellent seismic performance. BRB (buckling‐restrained brace) effectively enhances the seismic performance of buildings by providing excellent energy dissipation capacity and ductility. In order to study the failure mechanism and seismic performance of prefabricated CFST composite frames with BRBs, two specimens were tested under cyclic loading. The test parameters included the column cross‐section type and the end plate type. In this study, the failure mode, hysteretic curve, strength degradation, stiffness degradation, ductility, and energy dissipation capacity of the structure are analyzed in detail. The test result showed that the assembly CFST composite frame with BRBs improves structural response and can be used in cooperative work. Finally, the concrete filled steel tube composite frame with BRB was analyzed using OpenSees software. It showed good safety and can be applied and popularized in high‐rise composite structure buildings. The results showed that the numerical model is in good agreement with the experimental results, and the error is less than 13%. They exhibited good safety, so that they can be applied and promoted in high‐rise composite structure buildings.