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Notation

A_g = gross area of concrete section, in²
A_s= area of nonprestressed longitudinal tension reinforcement, in²
E_c = modulus of elasticity of concrete, psi
E_s = modulus of elasticity of reinforcement, psi
f_c^' ₌ specified compressive strength of concrete, psi
f_y = specified yield strength for nonprestressed reinforcement, psi
M_cr= cracking moment, in.-lb
M_u= factored moment at section, in.-lb

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According to ACI 18.13.5.7.1, for structures assigned to Seismic Design Category C, D, E, or F, reinforcement should be provided in uncased cast-in-place drilled or augered concrete piles where required by analysis and in accordance with the requirements in ACI Table 18.13.5.7.1

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