I am building a pier and grade beam foundation for room extension. Piers are 6′ deep by 12″ dia. The grade beam is trenched 12″ deep by 12″ wide. Piers are 6′ o.c. along trenched grade beam. Plans call for #3 spiral with 4 #5 vertical bars for pier with spiral ending at top of pier/bottom of grade beam with vertcal bars continuing up into grade beam with 90 deg hooks at top of vertical bars. Grade beam will have 4 #5 horizontal bars 2 top 2 bottom. My question is this, which is not evident in plans, do I need to wire tie the hooks at the top of the pier vertcal bars into the grade beam horizontal bars in any way, or is having the hooks in the grade beam sufficient?
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Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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Wire ties have no structural value at all. They simply hold the rebar in place. You must have the proper overlap of the two bars, usually 40 diameters.
I see the 40d overlap for splices in the plans general comments. Theres also general comments for the length of a90 deg hook of 12d. I asked my engineer if the hooks need to lap the horizontal bars in the grade beam, and he deferred that to consulting general rebar good practice.
Apparently my engineer sees the hook from spiral cage into grade beam as primary. Im just not clear if it is going to be a code violation if the hooks dont lap continuous grade beam horizontal bars.