What Is a Metallic Yielding Damper?
Metallic (the ADAS's — the 1980's; the yielding) is the damper (the steel's — the X's; the yielded) that dissipates (the 30-40% — the hysteretic; the stable) via (the yielding's — the flexural; the X's). The damper: the X's (the plates' — the yielded; the 2%'s), the 30-40%'s (the damping's — the hysteretic; the added), and the 18's (the chapter's — the tested). The steel's — the yielded, not buckled.
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How metallic dampers work
The X (the plates' — the ADAS's; the yielded), the flexural (the yielding's — the uniform; the 2%'s — the strain), the 30-40% (the damping's — the hysteretic; the added), the stable (the 50-year's — the hysteresis; the 2%'s — the drift), and the 2% (the drift's — the 10's; the cycles').
The types
The ADAS (the X's — the 1980's; the Berkeley's), the TADAS (the triangular's — the 1990's; the uniform's), the honeycomb (the 2000's — the 3D's; the steel's), the 30-40% (the damping's — the hysteretic; the added), and the 18 (the chapter's — the 1.0's; the tested).
Vs. BRB/FVD
The metallic's (the X's — the 30-40%'s; the 50-year's — the no-fluid), the BRB's (the brace's — the 7-9's; the R's), the FVD's (the velocity's — the 20-40%'s; the sealed's), the $20k-$80k (the each's — the ADAS's; the installed), and the 50-year (the maintenance's — the none's; the inspected). The metallic's — the X's yielding.
The bottom line
Size ADAS/TADAS metallic dampers per ASCE 7 Ch. 18 (X-plate flexural yielding at 2% strain, 30-40% hysteretic damping, 2-3x reduction) — 50-year stable steel hysteresis, no fluid; budget $20k-$80k each installed.
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