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Torsional Constant
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- Subject: Torsional Constant
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Wed, 26 Feb 2003 09:32:24 -0500
Nels, >From Roger L. Brockenbrough and Bruce G. Johnston's USS Steel Design Manual, for a rectangular cross section: fsubs = T * Gamma * t/J where, fsubs = torsional shear stress T = Torque t = thickness Gamma = a factor based on height/thickness ratio and, J = b*t^3/3 - 2 * Psi *t^4 where, b = height of rectangle Psi = a factor based on height/thickness ratio (Penciled in my book is the notation that 2*psi*t^4 term accounts for the loss of volume in ends of membrane analogy.) For b/t approaching 4, fsubs = Tt/J and, J = b * t^3/3 - .21 * t^4 For b/t = 4, 2 * psi = .2101, and gamma = 0.9970 For b/t = infinity, 2 * psi = .2101, and gamma = 1.0000 HTH A. Roger Turk, P.E.(Structural) Tucson, Arizona Nels Roselund 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? . > Nels Roselund ******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********
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