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1810.1.2.1 Reinforcement in Seismic Design Category C
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Where a structure is assigned to Seismic Design Category C in accordance with Section 1616, a minimum longitudinal reinforcement ratio of 0.0025 shall be provided for uncased cast-in-place concrete drilled or augered piles, piers or caissons in the top one-third of the pile length, a minimum length of 10 feet (3048 mm) below the ground or that required by analysis, whichever length is greatest. The minimum reinforcement ratio, but no less than that ratio required by rational analysis, shall be continued throughout the flexural length of the pile. There shall be a minimum of four longitudinal bars with closed ties (or equivalent spirals) of a minimum 3/8-inch (9 mm) diameter provided at 16-longitudinal-bar diameter maximum spacing. Transverse confinement reinforcing with a maximum spacing of the lesser of 6 inches (152 mm) or 8-longitudinal-bar diameters shall be provided within a distance equal to three times the least pile dimension of the bottom of the pile cap.
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