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Re: IBC 2305.3.10 2x2x3/16 plate washers

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> The CUREE Wood Frame Project has research results that strongly suggest
that
> sill plate washers be increased to 3x3x3/8 inch washers for 2x4 sills and
> 5x5x1/2 inch for 2/6 sills.

WOW!  Are we trying to keep the steel companies in business?   :-)

How much of a shear force are you trying to resist?  Is this only in zone 4?
Does going to a 3x member eliminate the need for these plates?

Dan Goodrich, P.E.


> CUREE is recommending this regardless of the
> sill bolt diameter used and regardless of whether the wall does or does
not
> utilize tiedowns. CUREE found through test results that these larger plate
> washers are necessary to delay or eliminate the onset of splitting in
shear
> wall foundation sills so that the more ductile withdrawal failure mode of
> sheathing nails can be assured of being the first mode in shear wall
> systems. The thicker, larger plate washers also reduce wall end uplift and
> cross-grain bending of the sills due to prying action of sheathing nails.
> Diagonal slots in the washers are intended to ease installation in
> situations where bolts are not exactly centered on sill plates. This may
end
> up as a future code change proposal.
>
> As far as sole vs sill plates, CUREE seems to be silent in this respect.
But
> wouldn't it make sense to use plate washers on any sole plates that are
> associated with shear walls that are likely to experience net uplift at
the
> sole plate? CUREE may not have published test results that address this
> aspect just yet.
>
> Fred Turner, Staff Structural Engineer, California Seismic Safety
> Commission, a public policy advisory agency, fturner(--nospam--at)quiknet.com, 1755
> Creekside Oaks Dr. #100 Sacramento, CA 95833 916-263-0582 Phone
916-263-0594
> Fax
>
>
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