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

[livewire9]

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?

 

[JedClampett]

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

 

[JAE]

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


Check out Eng-Tips Forum's Policies here:
faq731-376

 

[wannabeSE]

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.