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Design guidance for removable cantilever

Design guidance for removable cantilever

Design guidance for removable cantilever

(OP)
Hi guys.

Picture a single leg cantilevered table on a passenger railcar, that is allowed to yield in bending under accident conditions, but not allowed to become fully detached from the floor.

Does anyone have a reference I can use to size a moment connection of a round tube (approx 4 in dia) fitting over a smaller, thicker tube that is firmly welded to a base?

If I use thru bolts (or other screws)and I do not consider contact between the 2 parts, I need lots of bolts.  If this were a tightly fitting assembly, I'd need almost no bolts, due to friction and contact, until lots of rotation has occurred, which is allowed in this particular load case.

I will use some bolting to prevent the cantilever from completely separating after occurence of the plastic moment.

Any ideas for calc methods (excluding nonlinear FEA)?

tg

RE: Design guidance for removable cantilever

Hi trainguy

Do you mean a propped cantilever table?
Can you post a pic or sketch of your problem?

desertfox

RE: Design guidance for removable cantilever

If I'm picturing it right I'd size the bolt to prevent the leg separating from the base by tearing outunder say 2000N vertical separation laod (2g on a heavy man). I wouldn't fret about the analysis it is the loads that you don't know/can't predict.

 

Cheers

Greg Locock


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RE: Design guidance for removable cantilever

If the pieces nest tightly, then it is just the bending stress in the pipes.
 

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