I saw a thread on calculating the torsional constant, J (listed in table 1-25, page 1-89 of the AISC Manual) for shapes not listed in the manual. Although, it seemed like only how to evaluate torsion was explained. Does anyone know how to calculate this value. I need it only for equations F1-8 and F1-9 in the manual. I only need it to analyze the lateral torsional buckling limit state or an I-Beam. Does anyone know how i would calculate this? Thanks.
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