Effect of Forces on Gantry Cross-Sections?

[WandrinAndy]

Edit: In fact, if you send me or post the drawings (ideally just the cross section as a .dxf) I will run a FE stress analysis simulation since as irving has pointed out it would be good to get some idea of the torsional stiffness and calculate the second moment of area.

Thanks Jonathan.... Interesting as always.

Second-moment-of-area is beyond me, but thankfully I probably only need to understand that it's different to having a senior moment.

Afraid I currently only have SketchUp, where one can do a section plane if this would help, but haven't used it before so cannot promise... I've just recovered the files as is from the recycle-bin, let me know if it would be worthwhile me sending or posting them... they're 300-600KB each (Green and Red?). Would like to see the results for Adil's most recent Yellow too if that's possible.