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RE: Plastic Design Selection Table (pg 2-15 to . . .)

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The shapes with no listing for Mp or Py fail to meet the compactness 
criteria that is required for the development of the full plastic moment. 
As non-compact cross-sections, they'd be subject to inelastic local 
buckling prior to development of a fully yielded cross section.


On Tuesday, March 02, 1999 8:50 AM, Eddie Gonzalez 
[SMTP:Eagonzal(--nospam--at)ENG.CI.LA.CA.US] wrote:
> Does anyone know why Mp and Py is not listed for certain W sections, for 
Fy =
> 50?
> I believe it has something to do with not complying with the requirements 
> Chapter N of AISC ASD Specs but the comments on pg 2-15 are not clear as 
> which part of the spec may affect the listing of Mp or Py, other than 
that it
> is not a " 'plastic design section' ".
> Thanks in advance,
> ed gonzalez