Base plate holes for post installed anchors 1

[2jdevine]

I know that AISC design guide 1 provides recommended hole sizes for anchor rods in base plates. My question is if these same recommendations apply when you are using post installed anchors?

It seems to me that with post installed anchors you can remove most of the field fit-up issues that need the large holes. At the same time if you use standard holes you then could remove any need for welding of plate washers to transfer shear.

Does anyone know of recommendations or articles on this issue?

 

[KootK]

I agree with your thinking here. You should call Hilti and see if required installation clearances are such that post installed anchors can be installed in diameter + 1/8" holes. I've specified this for some small HSS fall arrest posts without incident. In retrospect, I wish that I'd checked the shop drawings to see if the fabricator put oversized holes in anyhow.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.

 

[hokie66]

It depends on the type of anchor. The manufacturer's literature will indicate whether or not a given type anchor can be installed "through the hole", and the size of hole required.

 

[Trenno]

Had a Hilti field engineer come to our office last week. Have a look into the dynamic set (below). Basically once the anchors are installed you pump this thing full of epoxy to create full and even shear transfer and eliminate problems due to bolt slip and unequal load sharing.

Link