RC Column:

Nominal cover – 40mm

Minimum dia. of longitudinal bar – 12mm.

Minimum No. of bars in Square/Rectangular Column – 4 No.

Minimum No. of bars in Circular Column – 6 No.

Minimum and Maximum Longitudinal Reinforcement – 0.8 %  & 6 (4) %.

 Slenderness limit for comp. member:

l/D > 12, Slender Column

l/D < 12, Short Column

Unsupported length < 60 times the least lateral dimension

Minimum Eccentricity of column = Unsupported length of column/500 + Lateral dimension/30 Or 20mm.

If the column is unrestrained, unrestrained length should be < 100*b*b/D.

Vertical formwork – 16 to 24hrs

Tolerances +12mm to -6mm

Transverse reinforcement spacing

• Least lateral dimension
• 16 x Main reinforcement dia.
• 300mm