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Metal deck...rigid vs flexible diaphrams

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RosePE

RosePE

Structural
Nov 7, 2010
1
Risa 3d user's manual rcommends that un-topped metal deck should be treated as a flexible diaphragm. It is common practice in our locale to use metal roof deck as a non-flexible diaphragm. If the decision is made to consider metal decking as a non-flexible diaphragm, would it then be appropriate to input the actual gage thickness as the diaphragm thickness?
 
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It would be appropriate to use the deck properties to create the plate elements which will make up the "diaphragm". Though you might want to reduce the G value for the material to account for fastener slip and such.
 
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