Return to index: [Subject] [Thread] [Date] [Author]

RE: E, allowable bending and allowable horiz. shear for #2 hem-fir KD 15%

[Subject Prev][Subject Next][Thread Prev][Thread Next]
I noticed this, too.  It appears that the WWPA Fv values are for "no splits" (see footnote 3 in Table 3 from the WWPA).  If you apply a Shear Stress Factor (C-sub H) of 2.0 for no splits to the NDS tabulated Fv of 75, you get the WWPA value of 150 psi. 
 
Hem-Fir (N), as someone correctly explained earlier, is graded according to Canadian rules written by the NLGA (National Lumber Grades Authority) headquartered in New Westminster, BC, Canada.
 
D. Williams
-----Original Message-----
From: Michael Bryson [mailto:MBryson(--nospam--at)mhpse.com]
Sent: Thursday, August 02, 2001 1:55 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: E, allowable bending and allowable horiz. shear for #2 hem-fir KD 15%

The WWPA values for Fv are twice the values that you list =150psi. I don't know what Hem-Fir(N) means.
-----Original Message-----
From: David Williams [mailto:dwilliams(--nospam--at)snydereng.com]
Sent: Thursday, August 02, 2001 9:44 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: E, allowable bending and allowable horiz. shear for #2 hem-fir KD 15%

From the 1997 NDS Table 4A Base Design Values for Visually Graded Dimension Lumber, for No. 2 Hem-Fir, width=2"+, Fb=850 psi, Fv=75 psi and E=1,300,000.  Values are for normal load duration and dry service conditions.  For Hem-Fir (N), Fb=1000 psi, Fv=75 psi and E=1,600,00. 
 
I don't know if this information is available on the web, perhaps others on the list know.  I have it on a CD that came with some commercial wood design software we use.
 

David L. Williams, P.E.
Vice-Pres., Snyder Engineering, Inc.
409 Vandiver Drive, Bldg. 5, Ste 203
Columbia, MO  65202
(573)449-9177 

-----Original Message-----
From: Ken Peoples [mailto:kspeoples(--nospam--at)lvta.net]
Sent: Wednesday, August 01, 2001 4:35 PM
To: seaint
Subject: E, allowable bending and allowable horiz. shear for #2 hem-fir KD 15%

I think this is an easy one, but who knows these days.  I seem to recall that the allowable bending stress of wood has been reduced in recent years and I thought I heard it had something to do with the way forests are managed to grow trees faster and then the growth rings are wider (I might have this wrong).  But anyway, I don't have a current NDS so what I would like to know is: What is the current allowable bending stress (Fb), allowable horizontal shear stress (Fv) and modulus of elasticity (E) for #2 hem-fir KD 15% (2x6's through 2x12's).   Is this information available on the web?
Thanks for your help.
Ken
 
 
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail:
kpeoples(--nospam--at)lvta.net