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Re: Re: ST - Allowable stresses for steel tees

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seaoc(--nospam--at),Internet writes:

A couple of people have responded to me to refer to AISC B5 and/or Appendix
 Please note that B5 only gives allowable width/thickness ratios, not 
allowable stresses; Appendix B applies if the member exceeds the ratios in
 However, when a tee meets section B5, AISC is not clear as to which
stress formula in Chapter F is to be used.  Thru direct e-mail, one responder

has suggested that section F1.2 applies to tees, using Fb=0.60Fy.  This 
appears to be the most plausible answer - however, the title of section F1 
does not clearly include tees, resulting in some confusion.  Does anyone have

an AISC document or text which confirms the applicability of section F1.2 to 

If you look at the equations in appendix 'B', logic will tell you that the
maximum you can use is 0.6Fy.  It states that maximum stress can not be
greater than 0.6Fy.  If you are trying to design something that does not meet
it than you are pushing your limitations.  0.66Fy is only for COMPACT members
with sufficient lateral bracing.  All others are a maximum of 0.6Fy.


Richard Lewis, P.E.
Missionary TECH Team

The service mission like-minded Christian organizations
may turn to for technical assistance and know-how.