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- To: seaint(--nospam--at)seaint.org
- Subject: 1/3 stress increase for 5 psf interior w
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Mon, 29 Nov 1999 21:04:21 -0500
Dan, IIRC (I don't have my codes handy) the 5psf on interior walls is not wind loading, but just a specified lateral load. This lateral load can result from people or material leaning against the wall but would most likely occur in an emergency situation where people are crowding together to get out of the building. In a situation like this, you (at least I) don't want interior walls collapsing and obstructing egress. Also, (again IIRC) the load for elevator shafts used to be 10psf to account for pressures built up during elevator operation but was reduced to 5psf about 20 years ago, which, again, is not a wind loading. Although it is ambiguous in the UBC (thru 1997), other codes, ASCE 7 and the forthcoming IBC 2000 amongst them, have a minimum wind pressure of 10psf. This loading of interior walls reminds me of when I was going to school, one of my classes was in one of the older buildings on campus. The first time that I leaned on the hallway wall, I thought it was going to collapse. A sharp push would have a wave traveling down the wall. Hope this helps. A. Roger Turk, P.E.(Structural) Tucson, Arizona Dan Vines wrote: >>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. Thanks Dan<<
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