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RE: Wind drift

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I am looking at the 1997 Wind Commentary for the UBC by the SEA of
Washington, its out of date but has a 4 page chapter that addresses this.
The newest version is for the 2003 IBC
http://www.seaw.org/resources_products.cfm  I hope they put out a 2006
version soon.

It says the UBC did not address wind drift criteria because it was a
serviceabilty issue and in most cases earthquake loads govern (Not sure I
agree with this) and "it takes fewer stories of building height in regions
of low seismicity for wind loads to govern." They do have recommendations.

Jeff

-----Original Message-----
From: Drew Morris [mailto:dmorris(--nospam--at)bbfm.com] 
Sent: Thursday, November 01, 2007 3:57 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Wind drift

Mark Deardorff wrote:
> 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.
>  
> Thanks,
>  
>
> 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
> mark(--nospam--at)rstavares.com <mailto:mark(--nospam--at)rstavares.com> www.rstavares.com 
> <http://www.rstavares.com/>
>
>  
>
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>  
I don't think there is one.  Story drift is given in the seismic provisions
of IBC/ASCE7.

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