In order to realize the buckling-restrained brace (BRB) with high energy dissipation performance, it is important to prevent early local bulging failure of the restraining part. In this study, local bulging failure in the strong axial direction of the core plate of the BRB with steel mortar planks is examined. Based on the experimental results and the discussion of previous studies, the strength of the restraining part against local bulging failure considering the effect of spacers was calculated and verified.
