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RE: Engineered lumber bolt bearing[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Engineered lumber bolt bearing
- From: "Paul Feather" <PFeather(--nospam--at)se-solutions.net>
- Date: Wed, 26 Sep 2007 10:36:45 -0700
Title: Engineered lumber bolt bearing
Thanks Buddy, Tom and all.
The question was only about engineered wood versus solid sawn. It occurred to me that a manufactured product utilizing some form of adhesive in the matrix would change the normal values more significantly. If you look at the increases in shear capacity, flexural, compression and so on, the resistance to crushing and splitting in perpendicular to grain loading would be similarly increased by at least some value.
Apparently, the shear and flexure increases must be based more on the consistent nature of a manufactured product with less ambiguity than solid sawn as opposed to any real increase in the matrix capacity.
Buddy [mailto:Buddy_Showalter(--nospam--at)afandpa.org] On
Behalf Of AWC Info
LVL and PSL use the same dowel bearing strength equations (values) from the NDS(r) as solid sawn lumber and glulam. The EWP manufacturer will list the appropriate specific gravity to use in their NER (as Tom pointed out). Typically they'll specify the same G as the material they use to manufacture the product. If there are any increases, that'll be in the NER.
The only additional clarification is that you would only use the perp to grain value if your LVL/PSL is loaded perp to grain. You would use the parallel to grain dowel bearing strength if loaded parallel to grain. Hankinson if somewhere in betweeen. I just wanted to make sure I covered that, because it wasn't clear to me if your question was only about engineered wood versus solid sawn or also parallel vs. perp.
John "Buddy" Showalter, P.E.
The American Wood Council (AWC) is the wood products division of the American Forest & Paper Association (AF&PA). AWC develops internationally recognized standards for wood design and construction. Its efforts with building codes and standards, engineering and research, and technology transfer ensure proper application for engineered and traditional wood products.
From: Paul Feather [mailto:PFeather(--nospam--at)se-solutions.net]
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