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Weak Axis Bending of Channels

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Does anyone use 75% of Fy for channels bent about their weak axis as you can for I-shapes and doubly symmetric sections (Section F2)?
 
Although it strictly appears you can't, it seems that you can get a plastic section modulus (Zy) that is almost 2 times the elastic section modulus (Sy) for channels. Thus it should be reasonable to use 75% of Fy for channels also.