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Re: Tube shape LRFD design

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Rich -

I assume you're reading 3rd edition LRFD, although this may not
have changed since 2nd edition.

The commentary (C5.1, page 16.2-33) indicates that, due to the
high torsional strength of closed sections, you can neglect LTB
for HSS flexural members.

Also, check out C7.2 on 16.2-38.  It describes the source of
the combination and implies (I think) that you have to design based
on My, not Mp, iin both axes, since the stress combination equation
is based on an assumed linear stress distribution.


Charles Hamilton, PhD EIT               Faculty Fellow
Department of Civil and                 Phone: 949.824.3752
    Environmental Engineering           FAX:   949.824.2117
University of California, Irvine        Email: chamilto(--nospam--at)

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