What Is a Viscoelastic Damper?
Viscoelastic (the 3M's — the 1970's; the solid) is the damper (the polymer's — the sheared; the 1-inch) that dissipates (the 10-20% — the hysteretic; the stable) via (the shear's — the VE's; the G''s). The damper: the G*'s (the complex's — the modulus; the 100 psi's), the 10-20%'s (the damping's — the added; the stable), and the 18's (the chapter's — the tested). The polymer's — the shear dissipated.
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How VE dampers work
The polymer (the 3M's — the 1-inch; the sheared), the G* (the complex's — the 100 psi's; the G'+iG''s), the 10-20% (the damping's — the added; the stable), the temperature (the 70°F's — the 100's; the G*'s), the frequency (the 1 Hz's — the 0.1's; the G*'s), and the 2% (the drift's — the 10's; the cycles').
Design per Ch. 18
The 18 (the chapter's — the 1.0's; the tested), the 100 psi (the G*'s — the 70°F's; the 1 Hz's), the 1.5-2x (the reduction's — the drift's; the force's), the 10-20% (the damping's — the added; the stable's), and the placement (the bays' — the 2-4's; the distributed).
Vs. FVD/friction
The VE's (the solid's — the 10-20%'s; the 50-year's — the no-fluid), the FVD's (the velocity's — the 20-40%'s; the sealed's), the friction's (the slip's — the 30-40%'s; the rectangular's), the $15k-$60k (the each's — the VE's; the installed), and the 50-year (the maintenance's — the none's; the inspected). The VE's — the polymer's shear.
The bottom line
Size viscoelastic dampers per ASCE 7 Ch. 18 (3M polymer in shear, G* ≈ 100 psi at 70°F/1 Hz, 10-20% added damping, 1.5-2x reduction) — solid-state 50-year stability, no fluid; budget $15k-$60k each installed.
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