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[SEAOC] Flexibility of metal deck

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We are peer reviewing a building design.  The designer maintains that ALL 
metal decks are "flexible."  We have heard this before, mostly from 

Our position is that, in fact, a metal deck can be quite rigid (either by the 
TM 5-809-10 definition, or by the 1994 UBC 1628.5 definition) and, if it is, 
should be analyzed as rigid.

Do YOU consider ALL metal decks to be "flexible", regardless of weld pattern, 
number of spans, diaphragm configuration, bracing location, etc.?