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Re: 3x framing for "shear design values" greater than 350 plf?

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Hi Scott,

Technically, the way you indicate this is written, the shear design value is
the governing condition.  I am not too familiar with the IBC, being in CA,
but the UBC is similar.  The biggest difference is in the UBC, the footnote
reads"when the allowable shear value exceeds 350 plf".

Therefore in answer to question 1, in the UBC we use the table value not the
"design shear".

For question 2, if a less than 350 plf panel is applied to each face with
offset joints, 3x framing is not required.  However also in the UBC, if the
total design shear for the wall exceeds 600 plf than 3x plates are required.

HTH



Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net
----- Original Message ----- 
From: "Haan, Scott M." <HaanSM(--nospam--at)ci.anchorage.ak.us>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, September 19, 2003 2:44 PM
Subject: 3x framing for "shear design values" greater than 350 plf?


> Hello:
>
> I have a couple of questions on International Building Code [IBC] Table
> 2306.4.1 footnote i.  Footnote i indicates:"In Seismic Design Category D,
E
> or F, where shear design values exceed ...350 plf (ASD)  all framing
> recieving edge nailing from abutting panel edges shall not be less than a
> single 3-inch nominal member..."
>
> 1)  Does the "shear design values" refer to the values in the Table
2306.4.1
> or the unit shear load in the wall?  If the load is 350 plf and the
> allowable unit shear from Table 2306.4.1 is 400 can the wall have 2x studs
> at abutting panel joints?
>
> 2)  If panel is applied to each wall face can 2x framing be used if "shear
> design values" are less than 350 plf on each face and the panel joints are
> offset per footnote h?   Is 3x framing required if the nailing pattern on
> each face has an allowable unit shear of 349 plf [total allowable unit
shear
> is 698 plf] and the panel joints are offset on different framing members
on
> opposite sides of the wall?
>
>
> Thanks.
>
> Scott M. Haan P.E.
> Chief of Building Inspections
> Municipality of Anchorage
> Development Services  Department
> phone: 343-8330
> fax: 343-8200
> cell: 317-6934
>
>
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