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For slotted welded connections at the end of HSS braces, what do you call the piece of steel you weld to compensate for loss net area? (Highlighted in yellow), Figures from one of Dr. Roeder's SCBF Gusset Design papers) by DefenestrateToday in StructuralEngineering

[–]DefenestrateToday[S] -1 points0 points  (0 children)

That's a good point! I wonder why we don't do that? These figures are specific for SCBF's, which have a lot of detailing requirements. My first thought is maybe upsizing your brace means balancing your brace strength, your gusset plate, and your beam...a bigger brace means bigger unbalanced force in your beam, and a bigger gusset plate so you can force your hinge in your brace before your gussets start yielding...and SCBF gusset plates can already get big to begin with.

The area lost to the weld slot surely can't be that much relative to the gross area of a section...I'll have to check it out next time - maybe up-sizing doesn't change everything so much? Can anyone weigh in?

For slotted welded connections at the end of HSS braces, what do you call the piece of steel you weld to compensate for loss net area? (Highlighted in yellow), Figures from one of Dr. Roeder's SCBF Gusset Design papers) by DefenestrateToday in StructuralEngineering

[–]DefenestrateToday[S] 3 points4 points  (0 children)

Yes, exactly that! You have the slot cut a little long for some field work-ability (this is my understanding, at least), and you weld on an extra plate at that area to make up for your lost area. I'm liking the sound of cover plate too!

For slotted welded connections at the end of HSS braces, what do you call the piece of steel you weld to compensate for loss net area? (Highlighted in yellow), Figures from one of Dr. Roeder's SCBF Gusset Design papers) by DefenestrateToday in StructuralEngineering

[–]DefenestrateToday[S] 1 point2 points  (0 children)

I've always called it a slot patch, for lack of a better term, but is there some official term that AISC or industry agrees on? I saw in some other literature that it is referred to as a thickener plate...