Full Length Reinforcing in Large Diameter Pier?

mrengineer · May 14, 2007

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.

ChipB · May 14, 2007

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.

jike · May 14, 2007

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

Qshake · May 14, 2007

For additional drilled shaft information check out the FHWA's publication on deisgn and construction of drilled shafts.

http://www.fhwa.dot.gov/engineering/geotech/library_arc.cfm?pub_number=1

Regards,
Qshake
[pipe]

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JedClampett · May 14, 2007

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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Full Length Reinforcing in Large Diameter Pier?

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