Design Parameters and Seismic Performance Analysis of Double-Yield Buckling-Restrained Braces

In order to solve the problem that traditional buckling-restrained braces do not dissipate energy under minor earthquakes， a novel double-yield buckling-restrained brace （DYBRB） with two-stage energy dissipation capability has been proposed. The brace yields energy dissipation and provides stiffness for the structure under minor earthquakes， while demonstrating better energy dissipation capacity under moderate to strong earthquakes. By analyzing the structural characteristics of the DYBRB， the working mechanism of this brace was obtained， the theoretical formulas for the double-yield displacement ratio and the yield bearing capacity ratio of the brace were deduced， and the main parameters affecting its design were identified.The DYBRB numerical model was established by ABAQUS， and its seismic performance was verified from three aspects： energy dissipation capacity， bearing capacity unbalance characteristics， and plastic deformation capacity. The research results showed that the DYBRB's hysteresis curve was stable，full， and symmetrical in tension and compression.The DYBRB exhibited good double-yield energy dissipation characteristics and plastic deformation capacity， enabling multi-level energy dissipation under different levels of earthquake action.