Longitudinal Reinforcement:- Maximum area of steel (i) When bars are not lapped Amax = 6% of the Gross area of column. (ii) When bars are lapped Amax = 4% of the grass area of the column. Minimum area of steel = 0.8% of the grass area of column. Minimum number of bars for reinforcement (i) For rectangular column = 4 (ii) For circular column = 6 Minimum diameter of bars = 12 m Maximum spacing = 300 mm