Unbonded buckling-restrained energy dissipation braces boast promising application values in both building and bridge engineering. Generally speaking, they are preferably installed at structural positions that require enhanced energy dissipation capacity, controlled lateral deformation or upgraded seismic performance, with differentiated design priorities tailored to various scenarios.
In building structures, such components are applicable to high-rise buildings, large-span constructions, irregular complex-shaped buildings, and structures subject to strict seismic fortification requirements. They are commonly arranged within frame bays, around core tubes, at the ends of shear walls or at structurally weak zones. The core function is to absorb seismic energy during earthquakes and prevent critical load-bearing members of the main structure from sustaining severe plastic damage.
In bridge engineering, unbonded buckling-restrained energy dissipation braces can optimize the energy dissipation performance of bridge piers, bearing areas and longitudinal restraint systems. Bridge structures are subjected to combined loads including seismic shocks, wind-induced vibration, vehicle braking force and temperature variations. Therefore, these braces must deliver stable cyclic load resistance and outstanding durability.
Furthermore, they exhibit great potential for retrofitting and strengthening existing structures. Adding or replacing energy-dissipating components at key structural locations can optimize the overall energy dissipation path of the structure. Nevertheless, it should be noted that all retrofitting schemes must be formulated based on thorough structural inspections, mechanical analysis and on-site engineering conditions; relying solely on this single type of component to address all structural defects is not feasible.