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Re: more aci 318

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There is a simple way to get around the Appendix D shear cone failure limitation.  Add shear stirrups or stud rails that pass through the failure cone.  Then you design the transfer from the AB to the shear reinforcement using a strut and tie approach.  This is discussed in ACI 318-08 Appendix D.
If you were near the edge of concrete you might still have a side blow out issue.
When you have multiple bolts in a group placing a large plate in the concrete can actually reduce your capacity.  There is a good graphic in ICC AC308 which explains why.  You want to engage the concrete below the bolt group.
According to Appendix D a standard double hex bolt will develop most anchor rods.  With the high strength rods you might need a plate but I would keep it thick.  If the flexural flexibility of the plate is significant it will not act as you assumed.
Mark Gilligan

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