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I think the 15psi thing is what is given as a value for non reinforced section against radial tension stresses for Doug-Fir.  Chech your AITC manual.  It seems that radial tension is somewhat the same as cross grain tension, just produced for different reasons.
Joseph R. Grill, PE
----- Original Message -----
Sent: Thursday, October 24, 2002 10:13 AM
Subject: RE:

15 psi is the going rate.  It is not in the codes.  George Richards, P. E.
-----Original Message-----
From: vicpeng [mailto:vicpeng(--nospam--at)]
Sent: Thursday, October 24, 2002 9:21 AM

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)