Classification of columns based on slenderness ratio:

1. l/h<12 Short column

2. l/h> long column.

3. l/b/> pedestal column.

Classification based on type of reinforcement:

1. Tied column: The main longitudinal reinforcement is enclosed within closely spaced lateral ties. (rectangualar or square).

2. Column with helical reinforcement: The main longitudinal reinforcement is enclosed with closely spaced and continuously wound spiral reinforcement. (circular or octagonal)

3. Composite column: The main longitudinal reinforcement of the composite column consist of structural steel sections or pipes with or without longitudinal bars.