What Is a Buckling-Restrained Brace (BRB)?
BRB (the AISC 341's — the yielding; the unbonded) is the brace (the steel's — the core; the yielded) that resists (the compression's — the unbuckled; the casing's) to dissipate (the 30-40% — the damping; the hysteretic). The brace: the core's (the yielded — the 2%'s; the strain's), the casing's (the 2.5x — the Euler's; the unbuckled), and the 341's (the chapter's — the tested; the 2's — the cycles). The brace's — the yielded, not buckled.
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How BRB works
The core (the steel's — the yielded; the 2%'s — the strain), the unbonding (the 1mm's — the debond; the slip's), the casing (the 2.5x's — the Euler's; the mortar's — the steel's), the 30-40% (the damping's — the hysteretic; the added), and the 2% (the drift's — the 10's; the cycles').
Design per AISC 341
The 341 (the chapter's — the 2's; the tested), the 1.3 (the omega's — the strain; the 1.5's — the beta), the connections (the 1.1x's — the adjusted; the gusset's), the 2% (the story's — the drift's; the 10's — the cycles), and the 7-9 (the R's — the BRBF's; the 8's — the special's).
Applications and cost
The retrofit's (the added — the minimal's; the disruption), the 7-9 (the R's — the BRBF's; the ductile's), the $15k-$40k (the each's — the 500-kip; the installed), the 50-year (the maintenance's — the none's; the inspected), and the 2-3x (the reduction's — the drift's; the force's). The BRB is the brace's — the buckling restrained.
The bottom line
Design BRBFs per AISC 341 (unbonded yielding core in 2.5x Euler casing, R 7-9, connection 1.1x adjusted strength, 2% drift qualification) — 30-40% hysteretic damping, 2-3x force reduction; budget $15k-$40k each installed.
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