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RE: Alternate Wind Provision

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I understand the definition.  I am only pointing out that the question of “rigid” came out during the seminar that I listened to, and the presenter, said that a plywood diaphragm would not be considered rigid for his simplified approach.  I don’t recall for sure if his simplified method is the same as what is being considered in the ICC hearings, but if I recall correctly, it is.  I may be wrong though.

Personally, I think his simplified approach, which tabulated net wind loads under certain criteria, is a pretty good thing for residential work.

I was just pointing out that there are those that would say that a plywood diaphragm does not support the “rigid” criteria for the simplified approach.  However, it may fall under the definition  of a “simple diaphragm”.

All the more reason to dislike the ASCE 7-05 wind criteria.



From: Gordon Goodell [mailto:GordonGoodell(--nospam--at)]
Sent: Tuesday, April 29, 2008 12:32 PM
To: seaint(--nospam--at)
Subject: RE: Alternate Wind Provision



I mostly use the analytical procedure b/c most of our stuff is too irregular to qualify for the simplified.  But looking at my 7-05 (most recent, I believe), the word “rigid” is not in the definition:

“BUILDING, SIMPLE DIAPHRAGM:  A building in which both windward and leeward wind loads are transmitted through floor and roof diaphragms to the same vertical MWFRS (e.g., no structural separations).


Gordon Goodell


From: Joseph R. Grill [mailto:jrgrill(--nospam--at)]
Sent: Tuesday, April 29, 2008 9:42 AM
To: seaint(--nospam--at)
Subject: RE: Alternate Wind Provision


A couple weeks ago I listened to a web seminar, ASCE with CEU units through NSCEA.  The name of the seminar was “Designing Buildings for Wind Load by ASCE 7-05”.  In that seminar it was also indicated that the simplified method was for a “simple diaphragm building” with one of the criteria being  “…wind loads are transmitted through rigid floor and roof diaphragms.”  A question was asked of the speaker if this method would include flexible plywood diaphragms and the answer was “no”.

Joe Grill

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