Cm-- Reduction Coefficient
Cm-- Reduction Coefficient
(OP)
Has three values per AISC 9th edition, Chapter H, page 5-55. Could someone focus more light on when to use which value. Will appreciate your reply.
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Cm-- Reduction Coefficient
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RE: Cm-- Reduction Coefficient
That being said, you may want to clarify your question. You say three values. I assume you are talking about items a, b and c on page 5-55. If so, then I would interpret their language as follows:
a) This one is primarily for columns in moment frames.
b) This one is primarily for columns in braced frames.
c) This one is primarily for compression chords of a truss. But, it also applies to column in braced frames if they receive any lateral loading between floor levels.
That's probably an over simplification.