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Re: Re: ST - Allowable stresses for steel tees[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Re: ST - Allowable stresses for steel tees
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 09 Oct 1997 22:42:57 GMT
- Cc: seaoc(--nospam--at)seaoc.org
seaoc(--nospam--at)seaoc.org,Internet writes: A couple of people have responded to me to refer to AISC B5 and/or Appendix B. Please note that B5 only gives allowable width/thickness ratios, not allowable stresses; Appendix B applies if the member exceeds the ratios in B5. However, when a tee meets section B5, AISC is not clear as to which allowable 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 tees? 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 rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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