Welded Truss Connections
Welded Truss Connections
(OP)
If a truss is defined by having pinned connections and therefore theoretically its members only carry axial load, why are so many trusses welded in real life? Would a welded connection not mean that they are also transferring moment?
I realize some moment and shear has to be developed in these members since they are not weightless but ultimately aren't welded connections considered a "fully fixed" or moment resisting connection? If I were to analyze a welded steel truss should I not analyze it with moment connections (which would ultimately make it a frame)?
Thanks
I realize some moment and shear has to be developed in these members since they are not weightless but ultimately aren't welded connections considered a "fully fixed" or moment resisting connection? If I were to analyze a welded steel truss should I not analyze it with moment connections (which would ultimately make it a frame)?
Thanks






RE: Welded Truss Connections
Yes, it does transfer moment, but the members of the truss will barely change as a result of fixing the web members versus pinning them. However, idealizing the truss with pinned-pinned connections for the web members will simplify analysis, which is why it is done in school, but I don't agree with it for practice. This was the way it was done in the past. With computers, you can simply model everything as truly built. Fix those connections and be sure to design the connections considering the moments transfer.
RE: Welded Truss Connections
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Welded Truss Connections
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