A Mixed Model Representing Accurately the Inelastic Behavior of Multi-storey Buckling Restrained Braced Frames

Abstract Seismic structural fuses such as buckling restrained braces (BRBs) are highly nonlinear members that need a detailed finite element model (FEM) to represent their actual behavior. On the other hand, making for whole building from solid or shell elements be consistent with of BRBs would require expensive computational time and large storage space especially when performing history analysis (NTHA). Therefore, mixed FEM is developed in this research so used core plate restraining system only. The non-yielding segments conjoined girders columns simulated using beam material properties while effect deformations taken during was able plastic hinge formation, rotations residual displacements members. A beam-solid transfer mechanism properly forces between BRB inner plate. connected surrounding contact simulate normal frictional generated upon based on penalty algorithm. This validated data results an experimental work mentioned literature where very good agreement achieved. Thereafter, rehabilitation study SAC 9-storey performed. showed how earthquakes confirmed ability inelastic behavior multi-story BRBFs.