What Is a Viscous Wall Damper?
VWD (the 1990's — the wall's; the 20-40%) is the damper (the 10-foot's — the 8's; the viscous) that dissipates (the 20-40%'s — the velocity's; the 10-foot) via (the 10-foot's — the 1990's; the wall's). The damper: the 10-foot's (the 8's — the wall's; the 1990's), the 20-40%'s (the velocity's — the 10's; the 10-foot's), the 1990's (the 30-year — the validated; the 100's), and the 8-foot's (the 10's — the wall's; the viscous'). The wall's — the viscous damped.
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How VWD works
The 10-foot (the 8's — the wall's; the 1990's), the 8-foot (the 10's — the viscous'; the wall's), the 20-40% (the velocity's — the 10's; the 10-foot's), the 1990 (the 30-year's — the validated; the 100's — the installed), and the 10-40% (the 20's — the velocity's; the wall's).
Design per Ch. 18
The 18 (the chapter's — the 1.0's; the tested), the 10-foot (the 8's — the 18's; the wall's), the 20-40% (the 18's — the velocity's; the 10's), the 1.5-2x (the reduction's — the 18's; the drift's), and the 1990 (the 30-year's — the 18's; the validated's).
Vs. FVD
The VWD's (the wall's — the 10-foot's; the 1990's — the 30-year), the FVD's (the brace's — the 20-40%'s; the sealed's), the $30k-$80k (the each's — the VWD's; the installed), the 30-year (the maintenance's — the sealed's; the 1990's), and the 100 (the installed's — the 1990's; the 30-year's). The VWD's — the wall's 10-foot; the FVD's — the brace's.
The bottom line
Size viscous wall dampers per ASCE 7 Ch. 18 (10x8-ft wall panels, velocity-proportional 20-40% damping, 1.5-2x drift/force reduction) — 100+ installed over 30 years; budget $30k-$80k each; sealed, maintenance-free.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.