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Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

(OP)
Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

Has anyone come across documentation justifying the use of lap splices in circular ties over the hooked ends detail described in ACI 318-14 25.7.2.4.1?

Per the code, circular ties need to have a minimum overlap of 6” and each end needs to terminate with a standard hook around a vertical bar. This seems to be a valid choice in heavy compression loaded columns where vertical reinforcement is acting as compression reinforcement. However if one is to use this circular tie detail in auger cast piles of 18” diameter or less, the hooked ends of the ties congest the center of the cage to where running a center bar through the middle with a spacer “football” becomes very difficult.

I have not found an exclusion/exception to the tie detail. This would leave spiral ties as the only viable tie method. Typically our pile designs only need vertical bars for flexural reinforcement in the top 25 ft or so and the shear loads are half the concrete capacity. So the circular ties are mainly for holding the vertical bars in place for casting.

RE: Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

Haven't checked the actual code provisions in 318 but I seem to remember at a recent seminar on 318 that the speaker mentioned that they changed this requirement - that lap splices were no longer allowed in circular ties.

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RE: Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

You could use a 180° hook rather than the 90° hooks shown in 25.7.2.4.1.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
www.americanconcrete.com

RE: Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

Or you could decide that Auger Cast are not columns, but something else, and not foloow the ACI 318 column requirements.
Pros
  • Round
  • Carry axial loads

  • Cons
    [ul]
  • Cast against soil
  • Loads continuously transferred into ground

RE: Circular Ties in Auger Cast in Place Piles per ACI 318-14 25.7.2.4.1

That's a good point JedClampett - 318 does not include drilled piers/piling. 306.1 does.

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