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Re: Shielding

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What happens when the wind attacks at say 30 or 45deg to the cluster.
Then you'd have say a 70mph wind moving through a 16ft wd by 120' high
slot - four of them in fact isn't that the situation?  Also, are there
going to be any people or other movable objects around the buildings?
It seems like a complex problem actually.  A problem not really
thought about in the code.  I would bet that a shielding model isn't
so hot of an idea in this case.  Maybe you need some wind tunnel or
CFD work.

-----Original Message-----
From: Bohm, Gabriel <GBohm(--nospam--at)>
To: 'seaint(--nospam--at)' <seaint(--nospam--at)>
Cc: Riddick, Gene <GRiddick(--nospam--at)>
Date: 09 September, 1998 7:15 PM
Subject: Shielding

>Your help is requested with the following wind loading situation.
>I have five identical buildings, spaced 16 feet apart. Building
>is 120 feet. Building width is 60 feet - this is the dimension
>perpendicular to the wind direction. The dimension parallel to the
>direction is 20 feet. The buildings are in perfect alignment, such
>the first one effectively shields the other four.
>Normally, we would design one of the five buildings treated as a
>self-supporting entity subjected to full wind loading, then simply
>five such structures, with or without interconnecting struts. The
>client, of course, understands the cost implications of this
>This time, it's different - the client insists that we take advantage
>wind load reduction due to shielding, and wants the five buildings to
>interconnected and treated as one large structure.
>ASCE 7-95, paragraph 6.5.4, prohibits shielding, but the client
>guarantees that the five buildings will always stay together. If so,
>using shielding makes sense. A call to ASCE confirmed that paragraph
>6.5.4 is not gospel. Unfortunately, ASCE 7-95 does not address wind
>loading for series of buildings. Here are my questions:
>1. Is it OK to apply wind loads only on the windward wall of building
>and leeward wall of building 5?
>2. Is it reasonable to assume that, as the wind goes around the
>buildings, vacuum will develop in the spaces between the buildings,
>which in turn will generate suction on all interior wall surfaces?
>3. If my above assumptions are incorrect, what would be the correct
>approach for applying wind loads?
>Many thanks,
>Gabe Bohm
>San Dimas, California