The authors have studied the buckling‐restrained brace providing a stable hysteretic characteristic even under high‐strain conditions. The structural performance of the buckling‐restrained brace is represented by the evaluation formula that is the lower limit of the cumulative plastic strain energy ratio. However, as earthquakes are becoming much longer, so it is necessary to research and develop a new buckling‐restrained brace with a higher energy dissipation capacity. In this paper, our past studies are reviewed and the conditions of high‐performance of buckling‐restrained braces extracted. The buckling‐restrained brace considered was tested. As a result, a buckling‐restrained brace with a larger cumulative plastic strain energy ratio is proposed.

The buckling-restrained brace must be able to provide the designed structural performance in actual use. In other words, the buckling-restrained brace must retain its initial quality in during the fabricating process. In this study, for the purpose of ensuring the initial quality of the buckling-restrained brace using steel mortar planks (BRBSM), quality control values at the time of fabrication are set and conduct verification testing on clearance and gap.

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The authors have studied the buckling-restrained brace providing stable hysteretic characteristic even under high-strain conditions. Structural performance of the buckling-restrained brace is represented by the evaluation formula that is the lower limit of the cumulative plastic strain energy ratio. However, when the duration of earthquakes gets extraordinarily longer, it is necessary to research and develop a new buckling-restrained brace with more high capacity of energy dissipation. In this paper, our past studies are analyzed and the conditions of high-performance of buckling-restrained braces are extracted. The considered buckling-restrained brace is tested. As a result, the buckling-restrained brace having large cumulative plastic strain energy ratio has been proposed.

A great variety of earthquakes such as the long period and long duration are predicted in the future. A high-performance buckling-restrained brace that is effective for those earthquakes is necessary. The authors have studied the buckling-restrained brace that has high-energy absorption capacities even in the high strain amplitude domain. However, not only the energy absorption capacities but also the fatigue performance is important. Therefore the authors confirm whether the buckling-restrained brace that had high-energy absorption capacities would become high-performance in the fatigue life. As a result, this buckling-restrained brace shows the high fatigue performance at the high strain amplitude domain.