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Re: Wood: 'en' and Plywood question.
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- Subject: Re: Wood: 'en' and Plywood question.
- From: "Mark T. Swingle" <mswingle(--nospam--at)earthlink.net>
- Date: Thu, 15 Jul 1999 01:34:15 -0700
Dennis: Re point 1): YES I assume you mean demand, not capacity. I agree with your math, and I will just put it another way so that we are both on the same page: If v is the shear in plf, and you have plywood one side with nails at 6" oc, the force per nail (demand) is: V=(v pounds/foot)*(6 inches)/(12 inches/foot) = v/2 pounds per nail [same as your v*(6/12)]. If you have plywood two sides with nails at 6" oc each side, AND THE TOTAL DEMAND IS STILL v, then the force per nail is V=(v pounds/foot)*(6 inches)/(12 inches/foot)/(2 sides) = v/4 pounds per nail per side [same as your v*(6/24)]. Re point 2): I always specify 15/32" or 1/2" 5-ply (struct I). I believe that the G values are the same for 15/32" and for 1/2", and also I believe there is not a difference in the code tables between 5-ply and 3-ply sheets. Many engineers do not specify Struc I, and VERY few specify 3/8". A previous post on this topic indicated that for OSB one should use plywood values. So, in summary, I think you would only have 2 values that are typically applicable: 1/2" Struc I and 1/2" CDX. I'm sure there will be dissenting opinions. Mark Swingle, SE Oakland, CA ------------------------------------------------ Dennis Wish wrote: > 1) I know this is an elementary, but I want to make sure I have it right. If > you sheath both sides of the wall using the same nail pattern (who wouldn't?) > do you reduce the nail capacity in half? > > For example if you have 8d at 6" on the edge on one side, the capacity per > nail is v*(6/12) per nail. However, if both sides are sheathed with 8d at 6" > o.c. is the capacity per nail v*(6/24) ? > > 2) What thicknesses of plywood and OSB are commonly used for shearwalls. I > always specify 15/32" 5-ply (struct I) panels but understand that some use > 3/8 or 1/2". With all of the choices for plywood's to determine wall > deflections, which panels should I be considering for common use in all of > the area's of the US (since the program calculates wind loads as well). > > I forgot to take this into consideration on my spreadsheet program and need > to add it. Any advice would be appreciated. > > Thanks > Dennis >
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