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RE: Torsional Constant

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Saint-Venant torsional constant  J = SUM (1/3) (b) (t)^3




Santa Clara, CA


-----Original Message-----
From: Nels Roselund, SE [mailto:njineer(--nospam--at)]
Sent: Tuesday, February 25, 2003 8:04 AM
To: seaint(--nospam--at)
Subject: Torsional Constant


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
Structural Engineer
South San Gabriel, CA