Frame plate with gusset bolt tearout analysis

[yojo]

Hello all,

I am trying to calculate the steel plate thickness of a bolted joint and I would like some recommendations on the best approach.

Situation:

I have a bolted joint that for simplicity sake has a plate on top, a plate on bottom, with a horse shoe gusset welded between the top and bottom plates. I then have a hole in the top and bottom plate for bolts to be placed in. The top and bottom plates are then pulled apart by the bolts with the gussets holding the assembly together. The bolts are also trying to tear through the plate. I know this type of gusset frame assembly is common but I have not found a calculation that will help me size the plate thickness. I have looked at tear out calcs and they do not seem to fit this situation. Also I think this case could be modeled as a cantilevered beam fixed on 3 sides (statically indeterminate) but I do not see how that would lead me to a tear out failure analysis.

Any comments welcome
Thanks

 

[Cockroach]

But in addition to the fasteners holding the piece, you have a weld. Therefore you have a compound situation: the weld and the bolts holding joint together.

You need to do the weld analysis separate from bolting. This is a statically indeterminate problem. I suspect this is why your bolting answers alone are off expectation.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada