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The NDS commentary covers the topic pretty well.  I'll paraphrase.... if the material is clear grain, check and shake free, "the tension perp design value may be considered as about one-third the shear design value parallel to grain".  As the NDS Commentary further says, "undetectable ring shake and checking and splitting that can occur as a result of drying in service, very low strength values for this property can be encountered in commercial grades of lumber".
Good luck....
-----Original Message-----
From: vicpeng [mailto:vicpeng(--nospam--at)]
Sent: Thursday, October 24, 2002 9:21

I obviously haven't looked enough.  Does anyone have an ideas for (allowable) tension across timber fibres (for DFir in this case)?
Don't ask why I want that!  I'm doing a "what if" or "how about" investigation that is taking me out to Mars and back :^)
Thor A Tandy  P.Eng, MIPENZ
Victoria BC
e-mail: vicpeng(--nospam--at)