"J" is the polar moment of inertia.
It is the square root of summation of square of moment of inertia
about "x-axis" and "y-axis".
You can find it in any standard Handbook.
Regards,
On Tue, Nov 24, 2009 at 6:52 AM, Joseph R. Grill <jrgrill@cableone.net> wrote:
> I have a small "T" section that will be a fabricated section. I'm a bit
> embarrassed, but I can't seem to remember how to calculate the "J" for a
> section (always been able to pull the value from the tables). It is needed
> for Lateral Torsional buckling equations for a tee section in the 13th
> edition of the AISC. Can anyone out there help me out.
>
>
>
> Thanks,
>
> Joe
>
>
>
>
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