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Re: single angle compression members

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Good observation!  In fact, in the first paragraph on
page 3-55, the sentence, " ..and its neglect in design
may lead to an underdesigned member" contradicts the
directive in Section J1.9, page 5-64. 

Charlie Carter may explain.

Rajendran


--- Ken Peoples <kspeoples(--nospam--at)lvta.net> wrote:
> I realize that I am looking at an outdated
> publication, but will ask your opinions anyway: AISC
> 9th edition J 1.9  indicates that the eccentricity
> of single angles connected by welding or bolting can
> be ignored for statically loaded" members, but page
> 3-55 gives a nice example showing that when the
> eccentricity is not ignored for the member design,
> the allowable axial compression load is greatly
> reduced (for the example the allowable load is only
> about 1/3 of the allowable load found when ignoring
> the eccentricity - there is a nice article written
> by Wayne Walker on this in the AISC Engineering
> Journal Second Quarter 1991 which has allowable load
> tables for single angles if any of you are
> interested).  Am I correct in my interpretation that
> the eccentricity can be ignored for the connection
> design only or was J1.9 was just "older" thinking as
> far as single angles goes and 3-55 was representing
> the results of newer research? (I see a reference to
> 1988 work on page 3-55 and 1942 work is referenced
> in the commentary for J1.9.)  Should the
> eccentricity of the connection be included in the
> connection design?
> 
> Thanks in advance.
> 
> Ken
> 
> Kenneth S. Peoples, P. E.
> Lehigh Valley Technical Associates
> 1584 Weaversville Road
> Northampton, PA 18067-9039
> Phone: (610) 262-6345
> Fax: (610) 262-8188
> e-mail: kpeoples(--nospam--at)lvta.net
> 


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