Vibration-Reduction Strategy for High-Rise Braced Frame Using Viscoelastic-Yielding Compounded BRB

A buckling-restrained brace (BRB) serves as a typical load-bearing and energy-dissipative device for the passive control of structures under seismic loading. BRB is generally designed to not yield frequently occurring earthquake (FOE) wind loads, resulting in it having less effectiveness vibration reduction compared with post-yielding performance. To address this dilemma, study proposed concept technique details viscoelastic-yielding compounded (VBRB). Different from conventional BRB, VBRB fabricated by attaching viscoelastic damper (VED) surface BRB’s steel casing, ensuring compatible deformation pattern between VED core. dynamic loading test specimens was carried out which 0.2 Hz~0.6 Hz rate maximum 550 kN capacity had been applied, verifying feasibility performance VBRB. Subsequently, parametric design procedure developed determine required parameters so that elastic drift response structure could be reduced code-prescriptive value. The wind-resistance performances were critically evaluated through time-history analyses on 48-story mega VBRB-equipped frame according Chinese code (GB50011-2010), approach also verified. Results indicate has advantages over providing multi-stage energy dissipation capacity, better vibration-control effect than BRBs subjected load excitations.