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RE: AISC Steel Spec Combine forces question

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Title: RE: New AISC Steel Spec

I had that same question - what does "referred to ............" mean.  Sorry for the non-answer but you're not alone with this question.


Bob Garner


From: Jason Christensen [mailto:jason.christensen(--nospam--at)]
Sent: Thursday, December 29, 2005 3:02 PM
To: seaint(--nospam--at)
Subject: AISC Steel Spec Combine forces question


To all,


I have been reading section H of the new steel spec.  This section is for designing members for combined forces and torsion.  My question is on section H1 it reads as follows:




1.         Doubly and Singly Symmetric Members in Flexure and Compression

The interaction of flexure and compression in doubly symmetric members and singly symmetric members for which 0.1 ≤ (Iyc/Iy ) ≤ 0.9, that are constrained to bend about a geometric axis (x and/or y) shall be limited by Equations H1-1a and H1-1b, where Iyc is the moment of inertia about the y-axis referred to the compression flange, in.4 (mm4).


My question is with the definition of Iyc, specifically the use of the word ‘referred’.  My first thought was Iy + Ad^2, this cannot be correct in that Iy is taken about the y-axis and transferring it to the compression flange does not make sense if my compression flange is involved in x-axis bending, i.e. transferring a y moment of inertia with an x direction.  My second thought is that Iyc is just the moment of inertia of the compression flange about the y-axis, but I am unsure of this also.  Any thoughts would be appreciated.





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