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RE: Wood: 'en' and Plywood question.

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Sorry - I didn't catch his reference to deflection only.
Al

> -----Original Message-----
> From: Seaintonln(--nospam--at)aol.com [mailto:Seaintonln(--nospam--at)aol.com]
> Sent: Thursday, July 15, 1999 12:54 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Wood: 'en' and Plywood question.
> 
> 
> Al, you misunderstood the question. This has nothing to do 
> with the capacity 
> of the nail. It is related to the calculation for deflection 
> which assumes 
> that the actual shear in the panel is distributed uniformly 
> to each nail at 
> the edge of the panel. Therefore if you had 240 pounds of 
> shear per foot and 
> the panel was nailed one one side at 6" o.c. you would have 
> two nails per 
> foot and each would take 120 pounds of the shear. My 
> questions was then if 
> you sheathed both sides of the wall, you would end up with 4 
> nails per foot 
> (two per each side). I asked if it was appropriate in the 
> deflection formula 
> to then consider the load to each nail as 60 pounds per nail.
> 
> I think that this is the correct interpretation of the problems.
> 
> Dennis Wish PE
> 
> 
> In a message dated 7/15/99 8:35:19 AM Pacific Daylight Time, 
> AGrathwol(--nospam--at)BoyleEngineering.com writes:
> 
> <<  
>  > 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?
>  
>  I don't know why you would do that.
>   
>  > 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) ?
>  
>  I see no reason to reduce the strength.  The nails on one 
> side of the wall
>  don't know that there are nails on the other side!
>  
>  > 
>  > 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).
>  
>  The UBC tables specify an allowable shear for various 
> plywood thicknesses.
>   >>
> 
>