Codal provision for columns ,as per IS-456:2000

 Codal provision for columns as per IS-456:2000 ,cl.26.5.3

In this article we discussed various codal provisions for columns as per IS-456:2000 in detail

Minimum % of steel = 0.8% 

Maximum % of steel in column = 4%(when lapping is allowed )

Maximum % of steel in column = 6%(when lapping is not allowed )

Minimum number of longitudinal reinforcement bars for square/rectangular column = 4

Minimum number of longitudinal reinforcement bars for circular column = 6

Maximum spacing between longitudinal bars in column is 300mm.

If we use helical reinforcement ass transverse than load carrying capacity of a column is increased by 5%.

  For lateral reinforcement 

Spacing between lateral ties is minimum of :-

1. least lateral dimension of compression members
2. 16 times of diameter of longitudinal bars
3. 300mm

Diameter of lateral ties will be maximum of 

1. 6mm
2. Diameter of main bars /4