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Re: Torsion on Wood Beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Torsion on Wood Beam
- From: Scott Maxwell <smaxwell(--nospam--at)umich.edu>
- Date: Wed, 9 May 2012 20:27:13 -0400
|Torsion for a rectangular shape gets fun. While the most significant aspect will be additional "shear stresses" due to torsion (remember "pure torsion" for a circular shape is ALL shear stresses), there will be some "warping" stresses that will produce some "normal" (aka axial/bending) stresses.|
So, based upon what you got from the Wood Engineering Handbook, it appear they are just giving you the shear stresses from torsion and potentially ignoring any "warping" stresses (i.e. normal stresses). If so, then the torsional shear stresses would have to be checked in combination with the "shear" shear stresses. If you also got some value for the normal stresses due to "warping", then this would be checked in combination with bending and axial stresses.
The best analogy that is available that I can think of is to look at how concrete code (aka ACI 318) handles it. Basically, torsion in concrete requires you to look at the "shear" reinforcement (aka "shear hoops") for both the shear and torsion...AND it requires to add additional longitudinal steel to what you have for bending because you will get the "warping" stresses due to most concrete beams being rectangular.
On May 9, 2012, at 6:10 PM, Drew Morris wrote:
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