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RE: Wind drift

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Although IBC 2006 does not address the wind drift issue but it  does not make sense to me if there is no limit on Wind Drift.
There must be a Drift limit to consider Deformation Compatibility/P-Delta effect and glazing/partition/non-structural components' tolerance.
Additionally In tall building the perception of motion due to wind becomes a design issue.

As far as my serves Canada and UK use L/500 and L/600 respectively for a 10 year return period for serviceability.

Casey (Khashayar) Hemmatyar, SE
Private <k(--nospam--at)>

From: Mark Deardorff [mailto: mark(--nospam--at)]
Sent: Thursday, November 01, 2007 3:51 PM
To: seaint(--nospam--at)
Subject: Wind drift


I hate to ask a stupid question. I have only been designing structures since 1976 so senility may have crept in to cleanse my brain from most information and memories. Nevertheless, I have never known of a limitation on wind drift. Once, I think in the Blue Book commentary, there was a mention of it but nothing official. Please fill me in.




Mark E. Deardorff, SE
R & S Tavares Associates, Inc
9815 Carroll Canyon Road
Suite 206
San Diego, CA 92131
Phone: 858-444-3344
Phone: 209-863-8928


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