huangyhg

circular anchor bolt patterns (refferences??)
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??

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.
i think you can still use app. d of aci 318. the assumed breakout area can be rectangular, even if the bolt pattern varies.
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.

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