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Re: LRFD HSS flexure analysis question

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Reference Table B5.1 of the LRFD Specification (1999):

All walls of a rectangular HSS section are "Stiffened Elements".

If you have bending in both directions, all walls at some time will be
subject to the requirements of "flanges of rectangular box and hollow
structural sections ... for uniform compression".  In addition, all walls
at some time will be subject to the requirements of "webs in flexural

If you have bending in just

Rick Drake, SE
Fluor, Aliso Viejo, CA


                      "Eric Green"                                                                                                     
                      <EGreen@walterpmoor      To: <seaint(--nospam--at)>                                                                 
                      01/22/03 09:07 AM        cc:                                                                                     
                      Please respond to                                                                                                
                      seaint                   Subject:  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.

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