Gusset bolts and welds
Gusset bolts and welds
(OP)
Butting heads with a fabricator over the horizontal bracing connection shown on the attached detail. The gusset is welded on one edge and bolted on the other. I've told them they cannot mix bolts and welds on the gusset. Am I off base here?





RE: Gusset bolts and welds
RE: Gusset bolts and welds
If I'm reading your drawing correctly.
Hg
Eng-Tips policies: FAQ731-376: Eng-Tips.com Forum Policies
RE: Gusset bolts and welds
But the gusset should be detailed with a distance back from the ends of the gusset connections per AISC. This allows out of plane plastic buckling to occur. See the attached detail from AISC. It doesn't appear that your detail does this. But as I said, if it is low seismic, then it isn't required.
RE: Gusset bolts and welds
RE: Gusset bolts and welds
RE: Gusset bolts and welds
It's when you have combinations of welds and bolts to transfer force across the same plane that you have to be careful (for instance if on one side of the gusset you had three bolts and 6 inches of weld - then you need to be careful to use SC bolts etc. to share force between elements.
RE: Gusset bolts and welds
RE: Gusset bolts and welds
Slightly off-topic, you mention using slip critical bolts to share the load with weld in a common shear plane. The 13th edition specification took this out. That has been the practice for a long time, but it was deliberately changed, as it has been shown to yield unconservative results in certain cases.
RE: Gusset bolts and welds