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RE: Torsional Constant

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>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?
The torsional constant J is calculated for a plate as (bt^3)/3, where b is the depth and t is the thickness.