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Re: Torsional Constant
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- Subject: Re: Torsional Constant
- From: Eric Ober <eric(--nospam--at)cagley.com>
- Date: Tue, 25 Feb 2003 13:56:37 -0500
I believe that, as an approximation, take the sum of bt^3/3 of all the component rectangular parts (like for concrete torsion constant) where 't' is the thinner dimension. So J for you would be 0.14 in^4 I believe. On a wide flange, you lose the fillets this way, but it's close enough usually.
Eric Ober
Nels Roselund, SE wrote:
I'm using Section F1 of the AISC Manual, 3rd edition, to analyze a 3/8" x 8" rectangular plate in bending about its major axis: it is subject to lateral torsional buckling.J is defined as the torsional constant. Where is the method of determining the value of J stated in the manual? J is the polar moment of inertia of a section in "Roark's Formulas for Stress and Strain" -- is that also the definition of J used here?
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- From: Nels Roselund, SE
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