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Re: welded truss design assumptions

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In the old days, we solved the stresses in the truss using graphical method, method of sections, or methods of joints. So it was practical to assume that the joints were pinned rather than fix.  Assuming them fix then, would result in more laborious  calculations and would end up almost neglecting the affect anyway. 

With the advent of computers, we can change the joint fixity by just pressing few buttons. At any rate, there is almost negligible difference between assuming the joints are fixed or pinned.

A. S. Quilala,  P.E.

In a message dated 9/10/02 5:11:44 PM Pacific Daylight Time, kspeoples(--nospam--at) writes:

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.

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)