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Spiral reinforcement of round column, pitch/spacing

Spiral reinforcement of round column, pitch/spacing

Spiral reinforcement of round column, pitch/spacing

(OP)
I am designing a reinforced concrete column, 24" diameter, with 1.5" cover. f'c = 3000 psi, fyt=60,000 psi.I find the minimum volumetric reinforcement ratio to be 0.069. By ACI-318, looks like I can choose from #3,4,or 5 bar for the spiral. With the diameter of the core as it is (21"), I get a very small clear distance, less than the minimum 1". Where have I gone astray?
Thanks in advance.

RE: Spiral reinforcement of round column, pitch/spacing

(OP)
Oh bloody hell, it is .0069! Works out to a #3 rebar at pitch of 3.03 and clear distance of 2.655 in. Thanks.
 

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