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HSS CRUSHING FORCE?

HSS CRUSHING FORCE?

HSS CRUSHING FORCE?

(OP)
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

RE: HSS CRUSHING FORCE?

Have you checked the walls of the HSS as little columns under compressive loads?  Be conservative.

RE: HSS CRUSHING FORCE?

(OP)
Costwise it is cheaper to have a larger tube on its edge.  Anyone else have any ideas how to calculate this?

RE: HSS CRUSHING FORCE?

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.  

RE: HSS CRUSHING FORCE?

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).   

RE: HSS CRUSHING FORCE?

(OP)
ok I will give that a shot

RE: HSS CRUSHING FORCE?

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

RE: HSS CRUSHING FORCE?

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.

RE: HSS CRUSHING FORCE?

(OP)
Does anyone know if the Ansys software in Inventor 10 can analize this type of stress?

RE: HSS CRUSHING FORCE?

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

RE: HSS CRUSHING FORCE?

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

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