Critique of column relocation requested
Critique of column relocation requested
(OP)
The attached drawing shows an elevation of one area of an existing mezzanine. The column needs to be relocated 30" to towards the 11 ft span. The existing beams (W14x22) are simply supported over each column but have two bolts in each web and a plate between the webs of the beam.
Here's how I'm considering approaching this. Once the column is moved 30", I'll analyze the beams with the 30" cantilever receiving the end reaction from the adjacent 22 ft beam. In reality, the knee brace will tend to pick up most of this reaction but I'll only consider this for the column analysis. I'm trying to be fairly conservative with my approach.
For some reason, this approach is not sitting well with me so I'd like some other opinions. Maybe it's because I'm tired and stretched thin at work, but it has not been my best day.
Here's how I'm considering approaching this. Once the column is moved 30", I'll analyze the beams with the 30" cantilever receiving the end reaction from the adjacent 22 ft beam. In reality, the knee brace will tend to pick up most of this reaction but I'll only consider this for the column analysis. I'm trying to be fairly conservative with my approach.
For some reason, this approach is not sitting well with me so I'd like some other opinions. Maybe it's because I'm tired and stretched thin at work, but it has not been my best day.






RE: Critique of column relocation requested
RE: Critique of column relocation requested
What do you plan on doing with the foundation? What purpose do the angle kickers serve? Are they for reducing the effective length of the column? If so, it is likely that they didn't design much fat into them so you should be extra careful with your capacity calculations.
Good luck!
RE: Critique of column relocation requested
RE: Critique of column relocation requested
The top flange can't be welded very easily due to a continuous bent plate welded to the top flange. It's possible, but it seemed to be more work than necessary.
The suggestions on flange stability and local buckling are duly noted and will be considered.
As far as I can tell, the knee braces are there for lateral stability. The columns are currently anchored to a thick, moderately reinforced floor slab. The column reactions are not very high, even with the column relocated.
RE: Critique of column relocation requested
RE: Critique of column relocation requested
RE: Critique of column relocation requested
RE: Critique of column relocation requested
You still have that problem due to the cantilever moment.
CTW,
My only concern would be if those diagonal kickers were there for lateral stability in which cace having a hinge between the column and the kicker may compromise the way this acts.
I would also think that there would be a much larger load on the kicker from strain compatability.
RE: Critique of column relocation requested