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Re: 1/3 stress increase for 5 psf interior wind load

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As far as my concern, this 5 psf load could be any temporarily, short-term load caused by either fire fighting water hose pressure or variations in air pressure or other reasons. So just considering it's short-term inherent property, 1/3 stress increase should be applicable.

Fariborz Tehrani,                      Phone: (310)509-8826
Civil Engineer                           Fax: (530)481-9532
BSCE, MSCE, PE                    Voice Mail: (877)743-6206
email: fmtehrani(--nospam--at)

From: "Dan Vines" <dan(--nospam--at)>
Reply-To: seaint(--nospam--at)
To: <seaint(--nospam--at)>
Subject: 1/3 stress increase for 5 psf interior wind load
Date: Mon, 29 Nov 1999 16:14:53 -0500

I have designed (picked out of a catalog, really) interior load bearing
metal studs for a small office type structure.

Dale/Incor, in their catalog, provides allowable axial loads for various
stud sizes at various heights under various wind loading condtions (other
manufacturers provide the same info).  Anyway, they have a footnote that

For components subjected to 5 psf and greater lateral wind loads, the actual
bending and axial stresses were multiplied by 0.75 in accordance with AISI
Section A4.4

AISI sect. A4.4 states: Where load combinations specified by the applicable
building code include wind or eq loads, the resulting forces may be
multiplied by 0.75.

The question is:  does the 5 psf interior wall loading prescribed by code
constitute a WIND load.  My boss and I both think so, but I would love a
second, third, or twelfth opinion.


Sherman D. (Dan) Vines
Willett Engineering Co., Inc.

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