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RE: Open Builiding with mesh tarp roof - Ref. Air Permeable Cladding ASCE 7-05 6.4.3 and 6.5.2.2

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Unfortunately, there is little formal guidance.  This is due to limited testing that indicates widely divergent pressures depending on angle, openings, type of material, etc.  Each element will develop its own drag coefficient.  It is possible to have larger forces than if the structure were enclosed with solid elements. 
 
However, you can do a wind tunnel test and end the ambiguity. 
 
Your extension regarding the MWFRS appears valid. 

Regards,
Harold Sprague



From: Suresh.Acharya(--nospam--at)ci.concord.ca.us
To: seaint(--nospam--at)seaint.org
Subject: Open Builiding with mesh tarp roof - Ref. Air Permeable Cladding ASCE 7-05 6.4.3 and 6.5.2.2
Date: Mon, 12 May 2008 12:33:30 -0700

Any guidance for an open building with mesh tarp roof? ASCE 7-05 sections  6.4.3 and 6.5.2.2 apparently disallows reduction in wind pressures on air permeable cladding unless documented otherwise. And, these sections pertain to "cladding". I would assume, by extension,  MWFRS will also see no reduction due to holes.
 
 
 
Suresh Acharya, S.E.


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