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Exposure D Wind

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Any wind guys or gals out there??

I just noticed that the 2000 IBC specifically includes Exposure D wind
category to the West Coast.  The 1997 UBC specifically excludes Exposure D
for areas with basic wind speeds less than 80 mph (fastest mile) which
includes central and southern California.  Does anyone know the background
to this?  Looks like all structures 1500 feet from the Pacific Coast will
need to be designed for higher wind loads.

Thomas Hunt
Duke/Fluor Daniel