hss crushing force

huangyhg

hss crushing force?
i have a hss foundation which will be on located on the ground.  i need to find the force which will crush the hss.  there will not be a moment on the piece i just need to prevent the vertical walls of the foundation from bursting outwards under design conditions.
thanks
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have you checked the walls of the hss as little columns under compressive loads?  be conservative.
costwise it is cheaper to have a larger tube on its edge.  anyone else have any ideas how to calculate this?
i think ucfse is giving you good advice.  you should have an effective width that your load is applied over.  this is more or less a web crippling problem which you can find an example in aisc 9th ed asd or by analyzing as an edge loaded plate.  more simply you can check the wall as a column assuming end conditions and check it against buckling.  
i'd agree...just use each wall as a finite mini-column supporting a load.
say your tube supported a baseplate 12" x 12" so the load is assumed spread over at least a 12" long piece of tube.  you could assume that it spreads out a bit beyond the 12" by d" where d is the tube height....
but then model the tube vertical walls as columns with height = d and fixed top and bottom against rotation but not against sidesway (k = 1.2).   
ok i will give that a shot
the above discusion makes sense, but i wonder what effect the radius on the tube corners will have on these calculations.  this would cause a little eccentricty of the vertical load resulting in some bending.  
just asking however, i haven't thought this one through yet.
-mike
you could model it in a good 2d program with the radius in there and the load applied to the flat section.  but other than that, i don't know what else you could do short of testing some tubes in a lab.  i think mrmikee has a good point.
does anyone know if the ansys software in inventor 10 can analize this type of stress?
darken99,
autocad mechanical (not mechanical desktop) has a 2d fea capability that i think would probably even be adequate to do what jae suggests.  i'm not familiar with how ansys works with inventor but i assume it would be far more advanced.  some of the inventor packages do include autocad and autocad mechanical too.
-mike
the ansys software in inventor 10 is extremely basic.  i believe this is a selling tool more than anything.  for real fea, i would not use it.  i have done 1 analysis with it and was very wary of the results, based on the mesh geometry, comparison with manual calcs, and comparison with an abaqus result produced by a friend of mine.
tg