ACI 318, Section 7.6 give spacing requirements between adjacent bars. Is the rod a hooked rod or headed anchor? What is the embedment? What are the forces in the anchor rod? Section 7.6 has minimum spacing requirements between adjacent bars in order to insure that concrete will flow around the full perimeter of the bars, however lap spliced bars are permitted to be in contact with one another.
Thanks for the quick reply. Typically they would be headed anchors. Embedment and forces would vary. My thought was as long as I was clearing the head of the anchor I would be ok. Typically I try to keep at least 1" but like you said lap spliced bars are allowed to be in contact so I was curious how others are treating this condition.
I would say it is engineering judgement as to whether the dowel and the headed stud are carrying similar loading.. As in are they both for shear? Or is one a shear element and the other is a tensile element.. If that is the case I would say they could be right next to each other.
If they are to be used additive for shear or tension, I would follow the above recommendation and treat it as a separate rebar and follow those spacing requirements so as to not have a local overstress in your concrete or masonry.
The rebar may have adequate length away from the headed stud / anchor rod so as to not need any development in the region where they touch. In that case, it would be ok.
It depends how you are designing the connection. If you can get the anchors to work out with the App. D calculations for breakout, then there is no minimum or maximum for spacing between anchor rods and pier reinforcing (though, I would still keep the anchors inside the cage). If you need to count on the vertical pier reinforcing to get out of the breakout calculations, then App. D gives a maximum distance between anchor rods and vertical reinforcing, but does not give a minimum.
Don't confuse this with lapping, it's not lapping. You are developing the pier reinforcement above the failure plane of the breakout cone.
