Load Bearing Capacity of HSS Tube

[macvicar]

I've got a situation where I need to raise a 4 legged stand about 5". I am thinking of using 2" wide pieces of 5"x5"x1/4" HSS tube. Each leg of the stand would bolt through the top horizontal surface of the tube, and the tube would be secured to the floor at the bottom with a concrete lag. The stand weighs approx. 2500lbs. How can I determine if the tube is adequate to support this load ?

Thanks

Jeff

 

[connectegr]

AISC Chapter K provides information for concentrated loads on HSS walls. But I am not sure there is information for your specific condition.

http://www.FerrellEngineering.com

 

[FranzR]

AISC 360, Chapter K of the spec deals with this problem. You could also assume the max moment to be PL/4 (P=2500lbs/4, L=5") and assume the bending capacity of the tube wall to be Fy*Z, where Z=2"*.25^2/4 and Fy=yield strength of tube (usually 46ksi for HSS members). The latter method is a conservative approach, but I don't think you'll have any problems making it calc out with the loads you are dealing with.

FranzR

 

[macvicar]

Thank-you FranzR! Since I'm not a structural engineer, would you be able to explain the calc method and result ?

Thanks

Jeff

 

[strucguy]

Can you provide a sketch?

 

[macvicar]

Here is a drawing of the unit.

Thank-you

Jeff