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anchor bolts in concrete

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the code and pca equations for anchor bolt embedment for tension in concrete 
seem to address shallow embedment (less that 24") in unreinforced concrete.  
these anchors are all affected significantly more by edge distance, group 
affects and anchor spacing than rebar.  is the action of a deeply embedded 
anchor bolt with a nut or deformed head at the embedded end significantly 
different than a rebar and if so why?  if a 1" diameter bolt is embedded 36" 
i am at the lap splice length for a #8 rebar.  if the bolt is embedded in a 
wall or pilaster, laps vertical reinforcing and is enclosed by ties, it would 
seem to act similarly to rebar.  does anyone have information on tis subject?

thanks in advance

paul franceschi s.e. 

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