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RE: welded truss design assumptions

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Ken,
if the truss is subjected only to concentrated joint loads, and there are no eccentricities of neutral axis joining the node, there will not be significants moments at nodes so both assumptions (pinned/fixed ends) will conduct to similar results. However, if the structure has loads along the members, flexure must be considered.
Joints shall be design accordingly. I mean, for angles subjected only to axial forces (pinned) you would need differents lengths of weld.
Hope this help.
Marcos J Salom
-----Mensaje original-----
De: Ken Peoples <kspeoples(--nospam--at)lvta.net>
Para: Seaint <seaint(--nospam--at)seaint.org>
Fecha: Martes, 10 de Septiembre de 2002 08:13 p.m.
Asunto: welded truss design assumptions

I am reviewing someone elses truss design and question one of his assumptions.  When we do trusses, we typically assume that the web members are pinned and that these members only carry axial load - even if the connections are welded.  The truss that I am reviewing was designed with all of the members assumed to be fixed ends.  It is a typical WT top and bottom chord truss with angle webs.  No special connections - just gussets in line with the WT webs and welds on one leg of the angles.  Just curious what the general concensus is out there.
Thanks in advance.
Ken 
 
 
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates
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e-mail: kpeoples(--nospam--at)lvta.net