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RE: torsional property "C" as listed in 'aisc hss connection man ual'

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Title: RE: torsional property "C" as listed in 'aisc hss connection manual'

>In order to have better torsional resistance from a steel girder, curved in
>plan, I am trying to use a wide flange section with side plates (thus
>converting it into a box section). I plan to follow the same procedure given
>in AISC HSS connection manual. However, while computing equivalent torsional
>properties of this built-up section, I do not find any procedure to
>calculate 'torsion property C' as listed in pages 1-12 thru 1-55 of AISC
>manual. Does anyone know how to calculate 'C' value of a built-up section?

No. C is a torsional property that is unique to closed cross sections, since it is a function of the area enclosed by the cross section. A W-shape or plate girder does not enclose any area, and therefore cannot have a property such as C for HSS.

Open cross sections behave differently (they have both pure torsion and warping torsion). For detailed information on this, see AISC Design Guide No. 13, Torsional Analysis of Structural Steel Members.

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Charlie