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Re: IBC 2305.3.10 2x2x3/16 plate washers

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Dan Goodrich asked: 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?

The CUREE summary of test results in its Topical Discussion G2 refers to a
range of tests from 352 pounds per foot (plf) to 1545 plf. For example, with
smaller 2"x3/16" washers, the ave ult load was 380 plf and 8 to 9 cycles
before sill splitting. 2x4 sills with somewhat larger 2-1/2"x1/4" washers
reached an ave ult load of 456 plf and 10 to 12 primary cycles of response
before splitting. 3"x1/2" washers eliminated sill plate splitting as the
failure mode or delayed splitting until both a greater number of cycles and
larger lateral forces were achieved. This research focuses on earthquake
response, but not just Zone 4. For more, see www.curee.org

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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