Circular Anchor Bolt Patterns (Refferences??) 1

[jasonjlind]

I have a circular base plate with a circular anchor pattern. I was looking for a reference on Breakout areas for breakout,pullout etc. I have references for square and rectangular anchor patterns but nothing mentioned for circular. Are there any suggestions as where to start??

 

[Teguci]

I'd probably start with CAD and show the anchors and their influence area. Determine the total area of influence and use that for An per ACI 318 - "Anchoring to Concrete" This will give you your tension capacity.

Not sure about your actual situation but this should get you started.

 

[JStephen]

I think you can still use App. D of ACI 318. The assumed breakout area can be rectangular, even if the bolt pattern varies.

 

[csd72]

Anchor force P= 4M/ND. where N=no. of bolts, D=diameter of bolt circle.

For poles up to 6' diameter, we tend to use a ring plate at the base of the anchor bolts and about 3'-6" down to make these behave as a group. Just remember that half your bolts are in compression if it is in bending.