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• To: "seaoc list" <seaoc(--nospam--at)seaoc.org>
• From: "T. Eric Gillham" <gk2(--nospam--at)kuentos.guam.net>
• Date: Fri, 6 Mar 1998 07:41:47 +1000

```Mark:

The relationship we use is :

p=.00256*V^2

p=wind stagnation pressure
V=wind velocity

I imagine that this is similar to that which you derived, but you can also
look at Eq (3), page 11 of ASCE 7-88 for a similar expression.

We have to use this because our design wind velocity is 155mph here on
Guam.  Just out of curiousity, is the structure you are designing located
in Okinawa?  This is the only place I know of that has a design wind
velocity higher than 155mph (although I imagine there are other places as
well, I just don't know about them).

Hope this helps.

T. Eric Gillham PE
----------
> From: Jessica Pemberton <jmpember(--nospam--at)softcom.net>
> To: seaoc(--nospam--at)seaoc.org
> Date: Friday, March 06, 1998 6:36 AM
>
> I have been involved with a panelized building
> system for areas subject to hurricane wind
> conditions.  The design speed was specified
> at 200 mph.  The 94 UBC does not have
> wind stagnation pressure coefficients for wind
> velocities above a maximum wind velocity (I
> think it was 110 mph).  I did however notice
> that these coefficients were propertional to the
> velocity squared and was able to derive a
> parabolic equation that would predict the
> coefficients for any wind velocity.  Is it
> acceptable to use this formula for wind loads
> as high as 200 mph?  Is there other provisions
> for such a high wind velocity?  How were the
> existing UBC coefficients derived?
>
> Mark Pemberton, P.E.
>
>
>

```