cantilevered tube

huangyhg

cantilevered tube
hi,
i have a 10x6 tube welded to a column to support a concrete panel. its cantilevered 3'-0" off the column, to support a 13k load. by design i can get the tube, weld, deflection to work. is there any worry of the tube rolling, and buckling? i cant convince myself that the tube is ok.
any input would be great
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i would check the system assuming the tube is installed slightly off true (rotated), and therefore the entire 13 kip load is loaded on one corner of the tube. this would seem to me to be the worst possible case.
this would induce a torsion of 13k x 3" = 39kip-inch. (i am assuming the 6" tube face is horizontal and the 10" face is vertical). on the face of it, this doesn't seem to be a very large torsion load to a tube   
agree with lkjh345,
i would expect it would only effect the welds/bolts which will have more shear load from the torsion.
have you done a full analysis of the connection to the hss connections manual?
csd
to keep the end of the tube from deforming under the offset load, you might consider adding an end plate on the tube. this might also prevent possible condensation from leaking out the tube and creating a stain on a ceiling below.