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What is the limit to the spacing of longitudinal bars on the column perimeter?

What is the limit to the spacing of longitudinal bars on the column perimeter? Correct Answer 300 mm

Concept:

As per IS 456: 2000, clause 26.5.3.1,

Longitudinal reinforcement in a column:

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

Additional Information

Percentage of steel:
 The cross-sectional area of longitudinal reinforcement shall be not less than 0.8% nor more than 6% of the gross cross-sectional area of the column.

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

The minimum number of longitudinal bar:

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

  • four in rectangular columns
  • six in circular columns

Helical reinforcement:

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

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