This paper presents a Shuttle-Shaped Truss-Confined Buckling-Restrained Brace (SSTC-BRB) and investigates its in-plane elastic buckling, load resistance and hysteretic responses. The SSTC-BRB is simply composed of a single steel tube core and several shuttle-shaped trusses sharing a single external restraining tube. It has not only aesthetical appearance, but also high axial loadcarrying efficiency, thus leading to an economical design. The elastic buckling performance of the SSTC-BRB is

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... gated, indicating that there exist two possible elastic buckling modes, namely symmetric and anti-symmetric buckling modes. Consequently the load resistance of SSTC-BRBs under monotonic axial compression is analyzed numerically and a lower limit of restraining ratio of SSTC-BRBs as a load-carrying type is recommended, where the cross-section of the core becomes fully yielded and reaches a plastic strain of 0.02 without global buckling of the SSTC-BRB. At last, the hysteretic performance of SSPTC-BRBs subjected to repeated axially compressive-tensile cyclic loads is studied numerically, and the corresponding lower limit of restraining ratio of SSPTC-BRBs is proposed as an energy-dissipation type.