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Inherent Torsion

Inherent Torsion

Inherent Torsion

(OP)
If you have a flexible diaphragm do you need to consider inherent torsional moment?  I am looking for clarification of ASCE7-05, Section 12.8.4.1.     

RE: Inherent Torsion

I believe the answer is NO. A flexible diaphragm does not act as a rigid body to transfer the torsional moment as shears into the lateral frames. Although if you run a computer analysis with a bare metal deck you will find that it has some stiffness based on which it will distribute torsion just like a rigid diaphragm would.

RE: Inherent Torsion

(OP)
Thanks, that's what I thought.

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