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Thanks for the analysis JoshPlumSE. That was very helpful. Out of curiosity, is there a balance point where the width between the top chords in compression is optimized compared to the trusses height? I've designed the truss at almost a 1:1 ratio. It's nearly as wide as it is tall (This was...

Thanks for the help. You guys provided some good references. KootK- I agree with you. Axial strength of the webs and deformation of the truss controls much more than global buckling does. As for trusting sound instincts, while I agree wholeheartedly with you on that comment, that doesn't stand...

Celt83- Thanks for that. Some useful info there, even though it's about box girders, not box trusses. I would assume they would act similarly.

JoshPlumSE- I applied a horizontal line load along the top of one chord. It had almost no effect on the deflected shape, or stability of the overall structure. P-delta doesn't appear to be a problem so long as the columns are horizontally braced. I suspect that I can use the lower unbraced...

In working through the design of a (3) dimensional truss with an inverted triangular cross section and a span of nearly 100ft, what would the unbraced length of the (2) top chord compression members be? Is it accurate to consider the unbraced member length the distance between the diagonals, in...