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Re: Shielding

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Don't forget the quartering wind.

Any sailors out there?  Your maximum speed (wind force) is not with a
following wind (perpendicular to the sail), but with a wind which gives
pressure to the windward and suction on the leeward.

I think your client may be leading you down a slippery slope.  The wind can
blow from any direction, and you can't turn your building complex so that
the wind only blows in a structurally favorable direction.

Ever wonder why many large sailing vessels are multi-masted?  If the sails
"shielded" one-another, you'd only have pressure on the aft sail and
suction on the forward one (rear and front or flat end and pointed end to
you land lubbers).  

I can just hear your client having you design a sailing vessel, "All those
extra masts and sails cost money, and they're of no value; the sails shield
each other.  Get rid of 'em".


Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561

> From: Bohm, Gabriel <GBohm(--nospam--at)>
> To: 'seaint(--nospam--at)'
> Cc: Riddick, Gene <GRiddick(--nospam--at)>
> Subject: Shielding
> Date: Wednesday, September 09, 1998 7:16 PM
> 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.

> Many thanks,
> Gabe Bohm
> San Dimas, California