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Full Length Reinforcing in Large Diameter Pier?

Full Length Reinforcing in Large Diameter Pier?

Full Length Reinforcing in Large Diameter Pier?

(OP)
For a 5' diameter straight shaft drilled pier, combination friction and end bearing, lengths 70-90', would you consider dropping off the vertical reinforcing at some point?  Surrounding soils are capable of providing lateral support for the entire length of the pier.

RE: Full Length Reinforcing in Large Diameter Pier?

I always look at the bending moment from the lateral load analysis and take it past the curve.  If there is uplift, you'll need to install a dywidag bar almost full length.

RE: Full Length Reinforcing in Large Diameter Pier?

We will generally will extend reinforcement 10 to 12 feet or until any bending moment might die out.

RE: Full Length Reinforcing in Large Diameter Pier?

I once tried to optimize the reinforcing by stopping it part ways down the shaft.  The Geotechnical Engineer caught it and notified me that he was counting on a fully reinforced shaft for uplift.  It was right there in the Geotechnical Report if I would of been awake enough to notice it.
Anyways, another reason to be careful before you stop the reinforcing.

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