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Re: Wood / lightframe shear walls without shear walls

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I see your point. If it is a nailed sill plate to the floor, I think the rocking of the shear wall would result mostly as partial plate nailing withdrawal (or are you referring to splitting along the edge at the shear ply nailing?). Splitting of the plate would be more likely with anchor bolts. Doesn't the requirement of the large square washers help in that case? Maybe a minimum requirement for the nailed plate to have a light strap or a plate at each end of the wall attaching to the rim joist would help.
In a message dated 7/8/2008 11:07:02 A.M. Pacific Daylight Time, Suresh.Acharya(--nospam--at) writes:
SHM & erik_g,
Thanks for the input, but I was expecting discussion on minimizing non-ductile mode of failure due to splitting of sill plates which, if happens, would not qualify for R=6.5 (no yielding of nails here). CUREE-Caltech tests have shown much better performance of sill plates when holdowns were present. Rocking of wood shear walls are not welcome unlike concrete or CMU shear walls.
Regarding dead loadstributary widths for resisting forces and seismic forces may not be necessarily same, but roof and ceiling dead loads are mostly lumped together in calculations. For example, ceiling joists and rafters spanning in different directions, or ceiling joists/rafters being supported by interior walls which are not shear walls, or due to presence of ceiling beams/ purlins/king posts etc.
Suresh Acharya, S.E.

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