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Which code requires 1% steel in concrete piers referenced in LPile?

Which code requires 1% steel in concrete piers referenced in LPile?

Which code requires 1% steel in concrete piers referenced in LPile?

(OP)
Does ACI 318 require the 1% steel reinforcement (vertical rebar) that is referenced in LPile software for drilled concrete piers?

Also, if one tries to design the rebar for less than 0.95% the following warning appears: "This is permissible only if lateral geotechnical capacity is less than the shaft's structural capacity." This seems counter-intuitive. Can anyone shed light on this?

RE: Which code requires 1% steel in concrete piers referenced in LPile?

It's in the ACI 318 code for minimum column reinforcing, Chapter 10.9.1

RE: Which code requires 1% steel in concrete piers referenced in LPile?

It might be in the latest ACI 336.3R. My 1993 copy doesn't have anything specific but the latest (2006) might have it.

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RE: Which code requires 1% steel in concrete piers referenced in LPile?

ACI 318 only has seismic requirements for piles in chapter 21. See §1.1.6 in ACI 318-11 for scope. The IBC requires cast in place piles to have 0.25% in Seismic Design Category (SDC) C and 0.5% in SDC D and higher. The reinforcing does not need to continue the entire length (see the IBC for requirements). The IBC may requires more in precast piles.

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