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# RE: LRFD HSS flexure analysis question

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• To: seaint(--nospam--at)seaint.org
• Subject: RE: LRFD HSS flexure analysis question
• From: "Jake Watson" <jwatson(--nospam--at)utahisp.com>
• Date: Wed, 22 Jan 2003 11:54:28 -0700

 You are correct.  There are different slenderness provisions for shear and for the "flanges".  Look at the lambda table a little more closely.  IIRC, that is where you will see the criteria.   Jake Watson, P.E.Salt Lake City, UT -----Original Message-----From: Eric Green [mailto:EGreen(--nospam--at)walterpmoore.com]Sent: Wednesday, January 22, 2003 10:07 AMTo: seaint(--nospam--at)seaint.orgSubject: LRFD HSS flexure analysis question When designing a HSS for flexure, the wall slenderness ratio is defined as h/t. My question, is h/t defined relative to the axis of bending, or is is defiend as the larger of h/t or b/t?   For example, assume a HSS12x8x3/8 is being bent about the strong axis, in which case h/t = 31.4 (and b/h = 19.9). However, of the same member is bent about the weak axis, h/t = 19.9 (and b/h = 31.4).  Should 31.4 be used for both analysis, or 31.4 for the strong axis and 19.9 for the weak?   It seems to me h/t is relative to the axis of bending and different number should be used for weak and strong axis bending.   Eric Green - Speaking only for myself, and nobody else.