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RE: Wind load on open box

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Does your wind always come from one direction?   :<)

Bill Cain, S.E.
Oakland  CA

	-----Original Message-----
	From:	James Lane, P.E. [SMTP:jamesalane(--nospam--at)hotmail.com]
	Sent:	Friday, March 03, 2000 8:01 AM
	To:	seaint(--nospam--at)seaint.org
	Subject:	Wind load on open box

	Have an existing 20'x20'x16'height box with the top open. The box
sets on 
	the top of a roof.

	Question: Does the second (leeward wall) pick up full wind pressure
as the 
	first wall? Any good references for how much the second wall will
pick up.

	In the past I have always been conservative and used full pressures
on both. 
	What if the bax were smaller the first wall would shield the second
wall and 
	you would think pressures would be less.

	Any comments
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