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Re: Shielding

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Never take a client's word that the buildings will remain forevermore.  Impacts on buildings should be the worse case of many (including surrounding objects).

Thor A. Tandy   P.Eng,  MCSCE,  MIPENZ
Victoria, BC, Canada
e-mail: <vicpeng(--nospam--at)>

-----Original Message-----
From: Bohm, Gabriel <GBohm(--nospam--at)>
To: 'seaint(--nospam--at)' <seaint(--nospam--at)>
Cc: Riddick, Gene <GRiddick(--nospam--at)>
Date: Wednesday, September 09, 1998 5:17 PM
Subject: Shielding

>Your help is requested with the following wind loading situation. 
>I have five identical buildings, spaced 16 feet apart. Building height
>is 120 feet. Building width is 60 feet - this is the dimension
>perpendicular to the wind direction. The dimension parallel to the wind
>direction is 20 feet. The buildings are in perfect alignment, such that
>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 build
>five such structures, with or without interconnecting struts. The
>client, of course, understands the cost implications of this approach.
>This time, it's different - the client insists that we take advantage of
>wind load reduction due to shielding, and wants the five buildings to be
>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 1
>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