Bolted Connection Design (Punching)

[cancmm]

I apologize if this was answered in another post but I've searched extensively but cannot find the answer I'm looking for...

I have a design where a square steel plate that is simply supported on two opposing ends. A hole is drilled through the center of the plate to accept a single threaded rod which will be under tension. The load is transferred from the rod to the plate through a heavy-hex nut (and washer if necessary).

I'm trying to determine the punching shear strength of the steel plate in order to help determine an appropriate plate thickness. I understand there is some guidance in the cold-formed manual, but I do not have a copy of that reference.

Any guidance or insight is appreciated as always.

 

[iponom]

Check out the HSS connections in AISC 13th Ed. for shear yielding (punching). p.16.1- 130-133

Punching shear is similar to shear yielding and the criteria shown in AISC 13th Ed. for HSS connections.

 

[ToadJones]

Is this thing heavily loaded?
How thick is the plate?
What is the rod diameter?

 

[BAretired]

I would think you could use Article 13.4.1.2 in CSA S16-01:

V_r = 0.55[φ]wdF_y

where w is the perimeter of nut or washer and d is the depth or thickness of plate.

BA

 

[DWHA]

I was conserned about this at one time also. I contacted AISC and they said they do not have any provisions on this failure, however they are of the opinion that it is not an issue unless you have very thin steel, such as gage steel.

 

[cancmm]

I remembered seeing this in the Canadian code a few years ago, thanks BA for the reference.

I'm surprised that AISC would be of the opinion that this isn't an issue, especially since it is discussed in other codes such as CSA.

 

[BAretired]

Are you saying that AISC does not have a similar expression for shear strength? I do not have a copy of AISC, but it must say something about shear strength.

BA

 

[hokie66]

I can't see the pullout of a rod from a plate being due to shear. Sure, it is a punching failure, but I think bending stress would be the concern.

 

[BAretired]

Bending should be checked also, but that is not a punching shear failure. Punching shear could govern if the span is very short.

BA