Keep in mind that concrete is very strong in compression but weak in tension. Steel reinforcements are added to concrete to carry the tension loads and prevent the concrete from pulling apart. Look where the concrete is most likely to pull apart and add steel to those locations, (most likely where it is bending in tension and around the perimeters).
A pier will likely be carrying a vertical compression load pushing it down into the ground rather than any vertical tension trying to pull it out of the ground. So there should be little need for vertical reinforcement, mostly for horizontal reinforcements and just enough vertical supports to keep the horizontal rings in position during concrete pouring.
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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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