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Re: Warping Constant and Torsional Constant for Built-up sections

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Xian Ma wrote:
> 
> Hi,
> 
> We are currently checking some columns (built-up sections of W
> section + channel + tee sections) under combination of axial force
> and bending moment.  Per AISC-LRFD (1994) manual Chapter H and F we need to
> calculate the Cw (warping constant) and J (torsional constant) for
> those built-up sections.  My questions are:
> 1) from which reference I can find some formulas for computing Cw and
> J for built-up section member.
> 2) what is the difference between Polar moment inertial J=Ix +Iy which
> is a measure of area's resistance to torsion and the J (torsional
> constance).
> 
> Any responses are highly appreciated.
> 
> Xian Ma, P.E.
> SWMB, Seattle
> xm(--nospam--at)skilling.com
> 
Check out formulas for Stress and Strain by Roark

Regards,
celso