double upn gusset connection 1

It depends on the loading. For bracing with small loads, I often use simple BAR stock and no cut gussets, simply welding them to the beam or the column flange. If welding them to the beam flange, it increases the beam reaction by a bit. I still find fabricators that ignore this improvement and still use full sized gussets, because it's the way they 'always have done it'. The cut gussets often have added bolts/welds that are not required; they may have an additional six HS bolts for a 5K factored load.

No structural restriction that I'm aware of and the AISC has articles on doing this.

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-Dik

hello dik
thank you for your response.
but I think you misunderstand the question. below is a picture of the top view of the above detail. we want to cut the upn end in each side to there be no gap between upn. the cutting edge from upn section is also shown in the second pic. all the structural elements are welded joints.

I don't believe that there is any AISC prohibition on what you propose. That said, it strikes me as an erection tolerance issue. It's all but certain that one of two things will happen:

1) Your slot won't be long enough and you won't be able to get the brace in or;

2) Your slot will be too long and you'll still have the gap that you seek to avoid.

I'm sure that you could minimize your gap of course. Maybe down to 1" or even 1/2" depending on how accurately things can be made to go together.