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RE: Torsion in wide flange shapes

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The LRFD Manual implies that you don't have to check interaction between any
kind of shear and axial stresses. Check each one independently. However, the
HSS Spec does have an interaction equation: f/Fcr+(fv/Fvcr)^2 < 1

-----Original Message-----
From: Harper, Mark [mailto:MHarper(--nospam--at)hdrinc.com]
Sent: Tuesday, January 08, 2002 10:53 AM
To: seaint(--nospam--at)seaint.org
Subject: Torsion in wide flange shapes


I have a condition where there is some torsional force introduced in the
column due to the geometry of the precast connection.  My question is
this, What unity check do I have to make if any?  Generally I would make
a combined bending  and torsional stress  check but I am not sure about
axial load and torsion.  Would it be fa/Fa + Tv/Fv <=1  Or maybe fa/Fa +
( Torsional bending stress/Fb)<=1 ???
I have ordered the AISC Steel design guide 9 on torsion, but would
appreciate any input.
Thanks,
Mark

Mark Harper PE, SE
HDR INC.
201 South Lake Ave. #705
Pasadena, CA 91101
mharper(--nospam--at)hdrinc.com
Phone: (626) 584-1706
Fax: (626) 584-1750


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