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# Calculating Rigidity of a diaphram

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## Calculating Rigidity of a diaphram

(OP)
Hello (this is my first post :) )

I am designing a structure with a cantilevered diaphragm. The shear walls are CMU walls, and the roof is plywood over 4x T&G.

How do I go about checking to see if the roof diaphragm is rigid or semi-rigid?

Thanks

### RE: Calculating Rigidity of a diaphram

ASCE 7-10 has a check for rigid s. flexible, section 12.3.1.3, the diaphragm is flexible when max diaphragm deflection is greater than 2 * the average drift of the vertical element. A semi-rigid analysis involves modeling the stiffness of the diaphragm.

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