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What is the minimum number of longitudinal bars provided in a reinforced concrete column of circular cross section?

What is the minimum number of longitudinal bars provided in a reinforced concrete column of circular cross section? Correct Answer 6

As per IS 456: 2000, clause 26.5.3.1,

Longitudinal reinforcement in a column:

The minimum number of longitudinal bar:

The minimum number of the longitudinal bar provided in column shall be

  • four in rectangular columns
  • six in circular columns


The minimum diameter of longitudinal reinforcement bars:

The main longitudinal reinforcement bars used in column shall not be less than 12 mm in diameter.

Percentage of steel:

The cross-sectional area of longitudinal reinforcement shall be

  • not less than 0.8 per cent of the gross cross-sectional area of the column
  • nor more than 6 per cent for unlapped bars of the gross cross-sectional area of the column
  • nor more than 4 per cent for lapped bars of the gross cross-sectional area of the column

 

Helical reinforcement:

A reinforced concrete column having helical reinforcement shall have at least six bar of longitudinal reinforcement within the helical reinforcement.

Spacing:

The spacing of longitudinal bars measured along the periphery of the column shall not exceed 300 mm.

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