Column flange modification
Column flange modification
(OP)
Is there any merit in the modification as shown in the attachment?
The detail is one that I've inherited and it's been used before, but I don't like it.
We are required provide additional clearance for new equipment adjacent to the column, hence the cut-out.
It appears to me that the angle of the transition pieces is too acute to be an effective detail.
The detail is one that I've inherited and it's been used before, but I don't like it.
We are required provide additional clearance for new equipment adjacent to the column, hence the cut-out.
It appears to me that the angle of the transition pieces is too acute to be an effective detail.






RE: Column flange modification
RE: Column flange modification
RE: Column flange modification
Your thoughts echo mine, I was just wondering if I had missed something.
We now need to explain to the client why the detail issued 8 years ago is not good.
RE: Column flange modification
RE: Column flange modification
RE: Column flange modification
We are still at proposal stage. It may be that the loads are so small that the detail does work anyway, despite its inefficency.
Also it's almost certain that the column hasn't seen full wind and crane loading.
RE: Column flange modification
RE: Column flange modification
of course, it's a nasty looking detail, but is it understrength to the standards at the time ?
as always you've got to worry about the spin the lawyers will put on it ... particularly since someone has stuck their nose into it !? and now there's a electronic history of it too ...
RE: Column flange modification
RE: Column flange modification
1. The loads on the defective element have redistributed to more stiffer elements/areas through frame action (over stress could occur somewhere away from this element, and its connections).
2. The real loads is much smaller than that in the original design.
3. Loading condition has changed, especially in industrial buildings, for instance - the newer equipment is lighter than it has replaced, change of use, fewer workers (due to plant modernization, layoff :)...
Each event has its own set of conditions, that require prudent evaluation and understanding in order to provide better solution to the task at hand, and to satisfy curious minds.
RE: Column flange modification
To me it violates the principles of good engineering. The only thing that can save it is a low level of loading.
RE: Column flange modification