Bottom flange cope to clear existing column
Bottom flange cope to clear existing column
(OP)
I am working on a connection detail that I would like some input on. It involves new beams going over top of an existing column. The new beam sizes had to be increased to support larger loads, but the existing column will remain.
Since the new beams are deeper they won't go over top the column without having the section reduced at the column interface. (See attached sketch) The top of steel elevation cannot be raised due to constraints of existing steel elevations that have to be tied into.
What is the best way to transfer the forces through the beam into the reduced section? Have any of you had success with certain application versus others? Recommendations are appreciated...Thanks.
Since the new beams are deeper they won't go over top the column without having the section reduced at the column interface. (See attached sketch) The top of steel elevation cannot be raised due to constraints of existing steel elevations that have to be tied into.
What is the best way to transfer the forces through the beam into the reduced section? Have any of you had success with certain application versus others? Recommendations are appreciated...Thanks.






RE: Bottom flange cope to clear existing column
RE: Bottom flange cope to clear existing column
RE: Bottom flange cope to clear existing column
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Bottom flange cope to clear existing column
RE: Bottom flange cope to clear existing column
I tend to make the ends of the cut-out, sloped, and weld pieces of plate to the web, so as to be the flange following the shape of the web cut out. Then I put vertical stiffeners above the flange plate junctions.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Bottom flange cope to clear existing column
RE: Bottom flange cope to clear existing column
RE: Bottom flange cope to clear existing column
That involves too much site work. You can mill the new piece of W12, but not the existing. Then you have a lot of holes to drill on site. Best to stick with a solution that can be shop fabricated.
RE: Bottom flange cope to clear existing column
As others have suggested, knife the seat plate around the web and extend it some distance lengthwise with the web. Essentially what you have is a WF shape to analyze for shear, web buckling etc.
Remember too, that stiffeners are a requirement at un-framed ends of beams...if these are un-framed.
I hope this isn't a crane runway!!!!
see generic sketch attached
RE: Bottom flange cope to clear existing column