15 mm

25 mm

30 mm

40 mm

1/4

1/5

1/6

1/8

2%

4%

6%

8%

0.15

0.12

0.3

1

Minimum cross sectional area of longitudinal reinforcement in a column is 0.8%.

Spacing of longitudinal bars measured along the periphery of column should not exceed 300 mm.

Reinforcing bars in a column should not be less than 12 mm in diameter.

The number of longitudinal bars provided in a circular column should not be less than four.