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# RE: Tale 6-1 of ASCE 7-05

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Tale 6-1 of ASCE 7-05
• From: "Scott Maxwell" <smaxwell(--nospam--at)umich.edu>
• Date: Fri, 30 May 2008 17:46:19 -0400

```That and the wind speed maps are kind of "wonky" and "jiggered" to work with
the importance factor and the combination of hurricane zones and
non-hurricane zones.  I am offering this based upon the fact that there are
discussions about going to three different wind speed maps for different
importance factors/levels/occupancy types.

Regards,

Scott

-----Original Message-----
From: chris.slater(--nospam--at)gmail.com [mailto:chris.slater(--nospam--at)gmail.com] On Behalf Of
Chris Slater
Sent: Friday, May 30, 2008 2:42 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Tale 6-1 of ASCE 7-05

This is a guess, but hopefully a logical one.

Since wind loads are a function of V squared, and since Category I buildings
are just storage and Ag buildings, it seems likely that they're giving a
break in the Importance factor for those buildings in the higher wind areas
to reduce the overall outcome of the calculation.

The calculated loads will still be higher in the V > 100 mph areas, since
they will be a function of V squared.

Hope that makes sense...

Chris

On Fri, May 30, 2008 at 11:22 AM, Casey K. Hemmatyar <khemmatyar(--nospam--at)gmail.com>
wrote:
>
> Is anyone familiar with the logic behind the coefficients 0.87 and
> 0.77 in Tale 6-1 (page 77) of ASCE 7-05? The Importance Factor "I" for
> Hurricane Prone Regions with V>100 mph is 0.77.
> While for Non-Hurricane Prone Regions & Hurricane Prone Regions with V<100
> mph, it is 0.87.
>
> Regards
>
> Casey (Khashayar) Hemmatyar, SE
>

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