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Re: WOOD - Load bearing studs in a party wall

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You're right. This code section specifically states that I can sheath the
wall on one side only. It just doesn't seem like the axial load capacity for
a stud wall sheathed on one side would have the same buckling resistance as
a wall sheathed on both sides. Thanks for the code reference.

Regards,
Bill Allen
-----Original Message-----
From: Charles Greenlaw <cgreenlaw(--nospam--at)speedlink.com>
To: seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org>
Date: Thursday, October 23, 1997 12:51 AM
Subject: Re: WOOD - Load bearing studs in a party wall


>The 94 UBC at sect. 2306.8, in its last paragraph, appears to squarely
>address this precise concern, where studs are "adequately sheathed on at
>least one side."
>The depth, not breadth, is used in calculating le/d.  Maybe it's that way


in
>later versions too. The same paragraph also covers truss top chords having
>planks or sheathing nailed to them on one edge; same outcome. See 2306.7
for
>the stud's flexural role: for 2:1 ratio as for 2x4's, no lateral support is
>required. CG.
>
>
>At 03:54 PM 10/22/97 -0700, you wrote:
>>I am checking the load bearing capacity of a wood framed wall that is
>>intended to be used in a party wall. This party wall consists of 2x4 studs
@
>>16" mounted on 2x6 top and bottom plates. These studs exist on each side
of
>>the wall. In other words, there are 2x4 studs @ 16" framed flush to one
edge
>>of the sill plate and 2x4 studs @ 16" framed flush with the other edge of
>>the sill plate. These two "rows" of studs are offset so that there
actually
>>exists 2x4 studs @ 8".
>>
>>In a "normal" wall, these studs are laterally braced on both faces. For an
>>interior wall, there is gypsum wallboard on both sides. For exterior
walls,
>>there is some kind of exterior sheathing (plywood or stucco) with gypsum
>>wallboard on the interior. Therefore, these studs are laterally braced
>>continuously about the minor axis. To determine the axial capacity based
on
>>l/d ratios, I have used the distance between the sill plate and top plate
>>for my "l" and the depth of the stud for my "d".
>>
>>In this party wall case, there is gypsum wallboard on only one face of the
>>studs. True, it is the compression face for the Code mandated 5 psf
>>partition load, but one edge is still laterally unsupported. My gut
feeling
>>is that the capacity of the stud is somewhat less than if there was gypsum
>>wallboard on both faces but a lot more than if there was no gypsum
wallboard
>>at all.
>>
>>Since I realize that I'm not the first structural engineer to be asked to
>>use a party wall as a load bearing wall, I am curious what others have
done
>>in the past to determine the capacity of studs laterally braced on one
face
>>only.
>>
>>Regards,
>>Bill Allen
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