Types of reinforcement
Minimum area of the cross section of the longitudinal bars must be at least 0.8% of the gross section area of the column.
The maximum area of the cross section of the longitudinal bars must not exceed 6% of the gross area of the column cross section.The bars should not be less than 12 mm in diameter.Minimum number of longitudinal bars shall be four in the rectangular column and 6 in the circular column.Longitudinal bars spacing measured along the periphery of a column should not exceed 300 mm.
The diameter of the helical rods should not be less than one / fourth of the diameter of the largest longitudinal and not less than 6 mm.
The pitch should not exceed (if helical reinforcement is allowed);
75mm,One / sixth of the core diameter of the column,Pitch should not be less than,25mm,3 times the diameter of the helical rod
Should not exceed pitch (helical reinforcement if not allowed)