10 Basic Rules for Column Design
1. Minimum size of column shall be 225 mm x 225 mm (9” x 9”)
2. Choose square column, if load acts at axis
of column
3. Choose Rectangular column, if load acts at
eccentric axis of column
4. Lapping length for column id 48d
5. Minimum 4 nos. of longitudinal bars
required for square and rectangular column and 6 nos. for circular column
6. Minimum dia. Of longitudinal bars is 12 mm
and min. dia. Of lateral tie is 8 mm
7. Longitudinal bars should be duck leg to
link with foundation
8. Minimum area of reinforcement percentage is
0.8% and maximum is 6% of column cross-section
9. M-20 grade concrete and Fe-500 steel used
for column
10. Spacing between ties not greater than 100 mm
for zone-A and not greater than 150 mm for zone-B
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