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RE: Wood Gurus - "Shakes"

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See p. 11 for the best figure of wood shake I could find in my brief search.
http://ceinfo.unh.edu/Forestry/Documents/nhblspg.pdf

I'll let others opine on Ch.

> -----Original Message-----
> From: Dave Adams [mailto:davea(--nospam--at)laneengineers.com]
> Sent: Friday, December 27, 2002 14:38
> To: seaint(--nospam--at)seaint.org
> Subject: Wood Gurus - "Shakes"
> 
> 
> Hello all,
> 
> NDS shear stress factor Ch is limited by splits, checks and shakes.  I
> understand what each of these is, but I'm still a bit fuzzy 
> on the shake
> & how to determine it's effect on lumber.  It is defined in the "Wood
> Handbook" (Forest Products Society) as a separation of fiber bond,
> between or through the annual rings, which is presumed to extend
> lengthwise without limit.
> 
> The allowable shake size is very small if one wants to take a 
> Ch greater
> than 1.0.  It seems to me that "Select Structural" should 
> qualify for at
> least a Ch of 1.33, but the descriptions for grading by WWPA appear to
> allow for larger shakes, which knocks us back to a Ch of 1.0 (max) ...
> the obvious answer is that one cannot just automatically use 
> a higher Ch
> than 1.0, or else it would have already been factored into the values
> listed in Table 4A.
> 
> Anyway (ramble, ramble, ramble), if anyone has information regarding
> grading and shakes (especially as it relates to good quality 
> lumber such
> as "SS"), I'd greatly appreciate it.
> 
> TIA,
> Dave K. Adams, S.E.
> Lane Engineers, Inc.
> 979 N. Blackstone St.
> Tulare, CA 93274
> PH:  (559) 688-5263
> FAX: (559) 688-8893
> E-mail:  davea(--nospam--at)laneengineers.com
> 
> 
> 
> 
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