Journal
BUILDINGS
Volume 12, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/buildings12081159
Keywords
buckling-restrained brace; viscoelastic-yielding compounded BRB; high-rise braced frame; vibration reduction; energy dissipation
Funding
- National Natural Science Foundation of China [52108439, 52108133]
- NationalKey R&D Program of China [2018YFC0705603]
- Jiangsu Province Natural Science Foundation [BK20210371]
- Fundamental Research Funds for the Central Universities [B210201019]
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This study proposed the concept and technique details of a viscoelastic-yielding compounded BRB (VBRB) that combines a BRB with a viscoelastic damper (VED) for improved vibration reduction. Experimental tests and a parametric design procedure were used to verify the feasibility and performance of the VBRB.
A buckling-restrained brace (BRB) serves as a typical load-bearing and energy-dissipative device for the passive control of structures under seismic loading. A BRB is generally designed to not yield under frequently occurring earthquake (FOE) and wind loads, resulting in it having less effectiveness in vibration reduction compared with post-yielding performance. To address this dilemma, this study proposed the concept and technique details of the viscoelastic-yielding compounded BRB (VBRB). Different from a conventional BRB, a VBRB is fabricated by attaching the viscoelastic damper (VED) to the surface of a BRB's steel casing, ensuring a compatible deformation pattern between the VED and the BRB's steel core. A dynamic loading test of VBRB specimens was carried out in which 0.2 Hz similar to 0.6 Hz in loading rate and a maximum of 550 kN in load-bearing capacity had been applied, verifying the feasibility and performance of the VBRB. Subsequently, a parametric design procedure was developed to determine the required VBRB parameters so that the maximum elastic drift response of the structure could be reduced to the code-prescriptive value. The wind-resistance and seismic performances of the VBRB were critically evaluated through dynamic time-history analyses on a 48-story mega VBRB-equipped frame designed according to the Chinese seismic design code (GB50011-2010), and the effectiveness of the approach was also verified. Results indicate that the VBRB has advantages over a conventional BRB by providing a multi-stage passive energy dissipation capacity, resulting in a better vibration-control effect than conventional BRBs for structures subjected to wind load and seismic excitations.
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