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@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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