Calculation example for a 1 sided threaded stud in to a plate

[chorner26]

Lets say I have a 3/8" diameter threaded stud with a nut on one side, going into a 1/2" thick 36ksi steel plate.
How would I calculate the capacity.
Plan checker says AISC only addresses a nut or mushroom head on both sides.

 

[r13]

How it looks, and how it is loaded? You probably do not have clear shear plane, but bending the rod.

 

[phamENG]

Plan checker is correct - bolt shear strength (even bolt bearing) depends on the confinement that comes from a snug tight bolted connection. That's why the pin equations exist - for when you have a pin or bolt without the confinement of the nut and bolt head.

 

[chorner26]

(r13)It is loaded in pure shear with the load coming in right at the plate interface. See attached.

(PhamEng) Do you have a design example that I can look at. The plan checker wants me to follow exactly something put out by AISC or AISI?

 

[r13]

chorner,

Plug weld the shank to the plate, then there is a defined failure plane with single shear capacity calculated as usual.

 

[azcats]

What are the constraints here? Can we help you figure out a better solution?

My understanding is that threads in mild steel aren't worth much. But with only 600# you're not asking for much either. And AISC won't have a solution here. (at least that I'm aware of)

I'd probably weld a threaded stud on and skip the hole entirely.

 

[phamENG]

I'm not sure what you're trying to accomplish. Does that say Bondo?

 

[XR250]

I'm not getting why this is a problem. Once the nut on the far side is installed how is this any different than bolting a part to a tapped plate?

 

[chorner26]

Yes it does says bondo for sealer for the out side of the plate. I would love to use a welded stud and skip this but it is already installed. (XR250) what is a design example for bolt into a tapped plate. That is exactly what we are doing.

 

[r13]

Try drill and insert shear keys to jam the shank in the plate.

 

[XR250]

(XR250) what is a design example for bolt into a tapped plate. That is exactly what we are doing.

Not aure I have one on hand, but your car's wheel lug bolts seem to work pretty well.
Seems to me as long as your plate is the thickness of a standard nut then the capacity would be a least as good as a single-shear, bolted connection.

 

[azcats]

This thread has some interesting discussion:

https://www.eng-tips.com/viewthread.cfm?qid=299014

In one of the attachments in there there's a calculation that considers the differing shear strengths of the fastener & plate.