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Column Slip Joint

Column Slip Joint

Column Slip Joint

(OP)
I have a project to install a new column inside of an existing building to support inside loads.  The new column is connected at the top to an existing wide flange.  The loads on the new column are light, so the column is supported by the floor beam underneath.

In order to avoid transfer of deflection loads from the beam above, I was going to use a bolted slip joint at the top of the new column.  I was going to specify that the bolts be finger tightened and then the nut tack welded to prevent loosening.  However, I was wondering if a second nut would be better.  Also, is finger tightening sufficient or should I let them snug tighten the bolts per AISC specs?  I feel like snug tight won't allow the slippage that I want.

RE: Column Slip Joint

Grease and weld is my prefered option.

ANY FOOL CAN DESIGN A STRUCTURE. IT TAKES AN ENGINEER TO DESIGN A CONNECTION."
 

RE: Column Slip Joint

Finger tight, damaged threads.
Don't use snug-tight.
Avoid tack welding the nut.
This is very common on wind columns.  

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