Abstract:High-strength steel frame with buckling restrained brace was proposed for the defects of high-strength steel in seismic application including poor ductility and low stiffness. Two full-scale single-span single-layer specimens were tested under quasi-static loading to investigate the seismic behavior of this structure. The deformation characteristics and failure mode of the structure under horizontal cyclic load were observed. The deformation characteristics and failure mode of the structure under horizontal loading were observed. The hysteretic curves of the structure and the components were analyzed and the load degradation, stiffness degradation, plastic deformation, energy dissipation capacity, horizontal force distribution and energy dissipation distribution were discussed. The results indicated that the hysteretic curves of the specimens were plentiful and stable. The plastic deformation capacity and energy dissipation capacity of the specimens were excellent with the maximum inter-story drift ratio to be 3% and equivalent damping ratio to be 30.4% ~ 36.3%. The horizontal loads were resisted by the steel frame and the buckling restrained brace together, while almost all the energy was dissipated by the buckling restrained brace. The failure mode of the specimen was buckling of the column flanges and fracture of the weld at the bottom of the column. The plastic deformation of steel frame was rather small, which was beneficial to repair after earthquake. Finite element model (FEM) was established by ANSYS. The results by FEM were in good agreement with the test results, which verified the effectiveness of the FEM.
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