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Steel truss buckling restraint length

Steel truss buckling restraint length

Steel truss buckling restraint length

(OP)
Hello dear colleagues,

I' ve a question on steel design, related to Eurocode but possibly applicable to other codes.

It's about the assumed buckling restraint length in the longitudinal (in-plane) direction for a truss chord.
For example, Eurocode 3 annex BB.1.3 (1)B says the restraint length is the system length, or distance between the joints.

My question is what is that "system length", would you say it's the distance between the truss external supports (therefore the truss full-length if simply-supported on both ends) or is it the distance between internal chord nodes (nodes defined by the diagonals and verticals meeting the chord) ?

Thanks!

RE: Steel truss buckling restraint length

Quote (OP)

or is it the distance between internal chord nodes (nodes defined by the diagonals and verticals meeting the chord) ?

That one. I find the "system length" wording confusing as well. Were the chords not braced in the plane of the trusses by the webbing, much of what we do in top chord design wouldn't work.

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.

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