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Re: torsional property "C" as listed in 'aisc hss connection m

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>Does anyone know how to calculate 'C' value of a built-up section?
>Thank you for your kind attention.
For thin wall multi-celled sections see Timoshenko's Strength of 
Materials book or any other discussion of the membrane analogy. (Stephen 
Pavelovich's discussion rules!) 

FYI, a box-in doubly symmetric section like an I has the same torsional 
stiffness as box alone--the web doesn't help.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)