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jhnblgr - The shape I've posted is acting as a beam. I've designed what I've referred to as a sleeve, which is effectively a solid piece of aluminum that fills the entire interior cavity. Yes - bolt bearing capacity of the holes is what controls here. I began this thread asking how this...

I suppose I'm second guessing because its effectively a tube and I'm used to dealing with girders at my 9-5. The bottom half of the cross section as area seems logical to me, as thats what would see a downward force, but I'm just hoping for someone to say "yes dummy", I guess.

A follow up on this - and this may be a bit of an elementary question. Step 3 in Smoulder's write up-> I can reasonably find the reactions at each end of the sleeve. The point loading has got me tripped up a bit. probably mostly because of the odd shape I'm using as the beam. To determine that...

Stress-eng- interesting stuff! Thanks for the study. I will definitely dive into it deeper. Smoulder- thanks for the step by step! Makes a lot of sense. I'll give it a shot.

Pham - I will look at this a bit more in depth. Looks like pretty good stuff. although it looks like they've broken it down to point loads where the rollers are. Which I'd have to think about a bit more to apply here. JD - cantilevered load - at the point of the cantilever, wouldn't both shear...

Bumping this back up - Can anyone help with some design guidance on even a tight fit tube within another tube designed to transfer moment ignoring the bolts? I have found a handful of posts saying "it should work" like people have done it, but struggling to figure out how to put it on paper.

A couple of you had some good ideas with "telescoping". Any good examples on how I would be able to do that? I am unsure on how exactly i'd design an inner sleeve to transfer moment, ignoring "locking pins" (the bolts). I imagine it'd have to be a good long length. Much appreciated!!

Hello, I am designing a system to permanently overhang A/V equipment overhead. It is essentially a beam supported by steel cables every 8 feet, with an assumed constant loading of equipment. I have been following the safety factor of 5 for rigging for all aspects of my design, including...

Appreciate the quick response you two! Yes, I know the length of the sleeve is likely adding capacity, but I am being very conservative here. Lets assume (random numbers for easy math) the sleeve is a 3" solid tube, with 2 1/2" bolts and 1" of hole edge distance. What area would I use for...

Im working on a beam problem that has my head spinning. It is an 8' beam with a splice 2' in along the span. The outer beam is a square aluminum tube and the inner sleeve is a solid piece of aluminum. I am trying to figure out the capacities of the bolts, the holes in the sleeve, and the holes...