Connection between Column and Base Plate
Connection between Column and Base Plate
(OP)
Designing the connection between the column and the base plate. The column is modeled as pin connected at the base. The column is designed for primarily gravity load, but need to resist some shear due to lateral loads.
There are a lot of design guides out there about how to design the base plate and anchor bolt (AISC Design Guide #1 for example), but not much about the connection between the column and the base plate.
I want to simply just weld the column to the base plate, designing the weld size to resist the shear? But would that weld count as fix connecting the column to the base?
Should I use AISC Manual Part 10 regarding Simple Shear Connections? or is this redundant?
There are a lot of design guides out there about how to design the base plate and anchor bolt (AISC Design Guide #1 for example), but not much about the connection between the column and the base plate.
I want to simply just weld the column to the base plate, designing the weld size to resist the shear? But would that weld count as fix connecting the column to the base?
Should I use AISC Manual Part 10 regarding Simple Shear Connections? or is this redundant?






RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
Generally though, the column is fully welded to the base plate so the size is never a question. The shear capacity for the smallest weld is still more than enough when you have that much of it.
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
If you wanted to get extremely technical, there will be a small amount of moment at the top of the base plate if the rotation takes place at the bottom of the base plate. As the moment approaches 0 at the connection because it is pinned it will have a certain miniscule value at the top of the base plate assuming the thickness of the base plate is not like 2ft or anything crazy like that.
RE: Connection between Column and Base Plate
Try checking the weld with equivalent, mises hencky theory of failure: σe=√(σ²+3*τ²)
If two bolts are not enough to resist shear, try welding a smaller profile to the base plate (wedge).
I captured some connection details.
Live long and prosper!
RE: Connection between Column and Base Plate
Live long and prosper!
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
Question: Is it commonly necessary to mill bearing surfaces after sawing?
Answer: No . . .
RE: Connection between Column and Base Plate
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
a- by inspection, does not need to be checked (shear in welds - obviously bolts will govern)
b- condition may exist on a sheet of paper but will never exist in the real world (welds in compression - any gap would be immediately filled by weld anyways)
Just call out base plates welded to the column and you're done OP.
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Connection between Column and Base Plate
RE: Connection between Column and Base Plate
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Connection between Column and Base Plate
The main point of the paper is examining multi orientation welds - helped me a lot to understand the M.w factor in S16. But they do conclude the base metal check is too conservative
RE: Connection between Column and Base Plate