Shear Capacity of Plywood Sheathing 1

[aokamura]

I'm hoping someone can assist me with this.

In the IBC2003 Table 2306.3.1, there are tabulated values for recommended shear for wood structural panel diaphragms.

In the "Structural I Grades" category, the largest nominal thickness of the panel it provides is 15/32". Is there a way to calculate an equivalent value for 5/8"? I'll be using a 2" nominal framing member.

What I have been suggested to do was, in the 2001 edition of NDS Design Specification for Wood Construction, there are Yield Limit Equations (Table 11.3.1A) to calculate the design value Z (single shear), take the value from Table 11Q (19/32", 10d common nails), and then take the ratio of the two values.

I then multiplied that ratio by the recommended shear value given in Table 2306.3.1 of the IBC, and that's what I used as the shear capacity of 5/8" plywood w/ 10d nails.

I'm hoping there's an easier way to do this, or if there are other sources that provide values for thicknesses that aren't in the IBC, that would be great.

Thanks in advance.

 

[OldPaperMaker]

aokamura,
I don't have the 2003 IBC but the 2006 & 2009 version of the IBC have an additional table, 2306.2.1(2)in the 2009 version, which is for High Load Diaphragms. This table has values for 23/32" Structural I. Depending on the loads it requires 3 or 4" boundary framing and 2 or 3 lines of fasteners.
APA-The Engineered Wood Association (

http://www.apawood.org)

has a form no. L350G called Diaphragms and Shearwalls design / construction guide. I think that it is available on line as a pdf.