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Wood beam splits
- To: seaint(--nospam--at)seaint.org
- Subject: Wood beam splits
- From: Jim Wilson <wilsonengineers(--nospam--at)yahoo.com>
- Date: Sun, 27 Jun 2004 12:42:30 -0700 (PDT)
I am reviewing a 3"x12" doug fir beam with wood splits along the length of the member. I've searched the archives and AWC and only come up with the elimination of the shear stress adjustment factor CH in the 2001 NDS. NDS 1991 Appendix E which provided Kv as a shear coefficient for horizontal shear has also been removed in the current NDS.
What is the current recommended design approach if there are no prescribed adjustments for splits?
AITC Tech Note 18 has a somewhat elaborate procedure for splits in Glu-lam beams, but does the theory transfer over to regular cut wood?
To repair an in-service beam with a deep mid-height longitudinal crack at bearing, my thoughts are to drive lag bolts vertically from the bottom of the beam up through the crack and almost to the top of the beam. I would start with say 4 bolts 3-6" inches on center, starting at the bearing point. The bolts would then act as shear pins to transfer horizontal shear between the top and bottom of the beam. Do wood beams perform in such a way that this would be a logical and appropriate fix? The beam is exposed, so plating the outside is far less desirable.
Jim Wilson, PE
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