What Is a Fluid Viscous Damper (FVD)?
FVD (the Taylor's — the 500-kip; the velocity) is the damper (the silicone's — the fluid; the orificed) that resists (the velocity's — the F=Cv^α; the out-of-phase) to add (the 20-40% — the damping; the effective). The damper: the alpha's (the 0.3-1.0's — the exponent's), the stroke's (the ±4-inch — the typical), and the 18's (the chapter's — the tested). The energy's — the fluid dissipated.
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How FVD works
The fluid (the silicone's — the 100,000 cSt; the orificed), the F=Cv^α (the velocity's — the force; the alpha's — the 0.3-1.0), the out-of-phase (the 90°'s — the displacement's; the peak's — the force), the stroke (the ±4-inch's — the typical; the ±12's — the max), and the 20-40% (the damping's — the effective; the added).
Design per Ch. 18
The 18 (the chapter's — the 1.0's; the tested), the alpha (the 0.3's — the nonlinear's; the 1.0's — the linear's), the 2-3x (the reduction's — the drift's; the force's), the 500-kip (the capacity's — the typical; the 2,000's — the max), and the placement (the bays' — the 2-4's; the distributed).
Applications and cost
The retrofit's (the added — the minimal's; the disruption), the tall (the wind's — the 40%'s; the comfort), the bridges' (the shock's — the transmission's; the STU's), the $50k-$200k (the each's — the 500-kip; the installed), and the 50-year (the maintenance's — the seals'; the inspected). The FVD is the velocity's — the energy's fluid.
The bottom line
Size FVDs per ASCE 7 Ch. 18 (F=C·v^α, α 0.3-1.0, target 20-40% effective damping for 2-3x drift/force reduction) — ideal for retrofits and wind comfort; budget $50k-$200k each installed with 50-year seal maintenance.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.