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Cb for Channels Bent About Major Axis (AISC 360-10 Section F2)

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Can anyone point out to me the equation or method for computing Cb of a 
Channel bent about the major axis, where there is "reverse curvature 

The General Provisions (Section F1) point you to the Commentary, but the 
Commentary seems only to address "singly symmetric I-shapes." Perhaps I'm 
missing something, but I cannot find anything that addresses C-shapes at 

Yes, I know I can use Cb = 1.0 conservatively - and likely will - but it 
bothers me that I cannot find anything in the Spec that addresses this 


William L. Polhemus, Jr., P.E.
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Because I AM that most bizarre of combinations, a THROWBACK-GEEK!

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