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Flexible Moment Connections - Advantage?

Flexible Moment Connections - Advantage?

Flexible Moment Connections - Advantage?

(OP)
Is there any advantage or reason to use flexible moment connections (previously 'type 2 wind) as defined by AISC? Is the idea to save on connection material at the expense of heavier beams?

RE: Flexible Moment Connections - Advantage?

Recommended reading:  thread507-303493: Type 2 (Wind Only) Moment Frame

Be careful with FMCs as laid out in my initial post in that thread.  To directly answer the question assuming a correct PR analysis is run, the advantages are a more distributed lateral resisting system with little extra connection costs at the expense of a good deal of extra engineering effort, which generally is neither appreciated nor paid for.   

RE: Flexible Moment Connections - Advantage?

(OP)
Thanks. I couldn't see any great logic in using them but I have seen it several times lately in reviewing low rise buildings and was wondering if I was missing something - it sounds like I wasn't.

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