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According to ACI 18.13.2.4, transverse reinforcement of columns or boundary elements of special structural walls that have an edge within one-half the footing depth from an edge of the footing should be in accordance with ACI 18.7.5.2 , ACI 18.7.5.3 and ACI 18.7.5.4 (These 3 titles are explained in Transverse Reinforcement (CRD)). This transverse reinforcement should extend into the footing, mat or pile cap a length equal to development length, calculated for fy in tension, of the column or boundary elemant longitudinal reinforcement.
According to ACI 18.13.2.5,