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Wasalam, Dear Shamim, These are basics of RCC design to know the required reinforcements, if reinf %age is 2.3%, your column size is 12"x12"(say) you will get longitudinal reinforcement as 2.3x12x12/100 = 3.312 in^2, now you can convert this 3.312 into different number of bars, if you are using #6 bars its area is 0.44in^2, Number of #6 rebars= 3.312/.44 = 7.52 make it 8 #6 bars as longitudinal bars in RCC Column. Regards