Quote:
Originally Posted by Don098
Yea, that's expansion vs. contraction...not air pressure...?  You ok today Zen?
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Cabin Fever !!
I'm getting tired of that four letter word that begins with S.
Like the interior of a modern locomotive or a tank, the building will have a slight positive pressure no more than one or two psf above atmospheric though. Like the tank it's for NBC protection.
Now consider wind loads. Even 2 psf pushing out is nothing compared to say 45 psf pushing in. A 130mph wind would produce almost 1.5 tons of pressure on one 5 by 13' 4" panel. (The load would not be uniform across the entire surface of the building and forces on the leeward side could even cause negative pressure, trying to pull the glass out of it's frame.)
Very complex stuff, fluid dynamics.
NBC= Nuclear, Biological, Chemical.