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RE: torsion in stair girder

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I agree with Andrew completely…torsion is not an issue here.

 

Compatibility and offsetting eccentricities with the slab on one side

and the stair stringers on the other will negate/minimize any potential torsion effects.

 

 

  

 

David L. Fisher SE PE

Fisher + partners

372 West Ontario

Chicago 60610

 

312.573.1701

312.573.1726 fax

 

312.622.0409 mobile

 

www.fpse.com


From: Andrew Kester [mailto:akester(--nospam--at)bbma.com]
Sent: Thursday, July 29, 2004 10:05 AM
To: seaint(--nospam--at)seaint.org
Subject: torsion in stair girder

 

Mark:

 

If this is a composite slab, then you can easily say that the slab is bracing the top of the beam and any torsion is resisted by the slab- headed stud interaction. I am sure the same can be said of the metal deck in non-comp, it will brace the top flange. On top of that, whether you want it to or not, the stair stringers themselves will resist any torsion in the beam. This is as redundant as it gets.

 

Nobody that I know designs for torsion in this instance, nor do I see any need to do so. Convincing the plan checker is another issue...

 

Regards,

 

Andrew Kester, PE

Longwood, FL