An unbonded buckling-restrained energy dissipation brace is an energy-dissipating component applied in building and bridge structures. Its primary function is to undergo deformation when the structure bears cyclic loads such as earthquakes or strong winds, and dissipate energy via itself to reduce the risk of damage to the main structural frame. Compared with conventional braces, such components place greater emphasis on stable energy dissipation capacity and cyclic deformation performance.
Its basic working principle can be interpreted as follows: when lateral displacement occurs in the structure, the brace sustains repeated tension and compression loads. Through well-designed inner core, outer sleeve and unbonded layer, the component can continuously dissipate energy within a certain deformation range, while mitigating adverse impacts induced by local buckling. This design concept has attracted extensive attention in the fields of seismic resistance for buildings and wind resistance for bridges.
From the perspective of engineering application, unbonded buckling-restrained energy dissipation braces do not function independently but work in coordination with the overall structural system. They can be installed in frames, shear walls, bridge piers and other positions that require enhanced energy dissipation capacity. Their core advantages lie in strong deformability, a well-defined energy dissipation mechanism, and the feasibility of centralized energy dissipation design at critical structural zones.
Nevertheless, the actual performance of such components is affected by multiple factors including material properties, manufacturing precision, installation quality, connection details and calculation assumptions. Therefore, in practical engineering projects, comprehensive evaluation combining structural analysis results, test data and relevant design specifications is required. The component shall not be directly adopted merely based on conceptual introduction.