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RE: 1/3 stress increase for 5 psf interior wind load[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: 1/3 stress increase for 5 psf interior wind load
- From: Robert Rollo <rrollo(--nospam--at)TEAM-PSC.com>
- Date: Mon, 29 Nov 1999 15:39:11 -0600
Title: RE: 1/3 stress increase for 5 psf interior wind load
good question. we have always taken the "wind and EQ" thing to mean the partition load (or any temporary short duration lateral load for that matter).
it may actually be the "leaning person" load, the leaning pile of books, the eccentric effects of wall mounted cabinets, wall mounted water closets, etc.
is the reduction for laterals really a statistical thing like the LDF in wood design ? laterals like the fully loaded wall mounted upper cabinets may need higher than 5psf, i never really checked. . . .
i guess the real question is: what is the origin of the 5 psf to begin with (Corps of Engineers requires 10 on masonry interior partitions). Could it be loosely based on a differential internal pressure thing like in AISC? or is it simply a good idea CYA thing ?
fwiw: i have 2 other mfr's catalogs that do the same 0.75 reduction.
From: Dan Vines [SMTP:dan(--nospam--at)willettengineering.com]
Sent: Monday, November 29, 1999 3:15 PM
Subject: 1/3 stress increase for 5 psf interior wind load
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 states:
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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