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What is the minimum number of longitudinal bars to be provided in a column of diameter 350 mm?

What is the minimum number of longitudinal bars to be provided in a column of diameter 350 mm? Correct Answer 6

Explanation:

As per IS 456: 2000, clause 26.5.3.1,

Longitudinal reinforcement in a column:

Percentage of steel:

  • The cross-sectional area of longitudinal reinforcement shall be not less than 0.8 percent nor more than 6 percent of the gross cross-sectional area of the column.

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.

Spacing:

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

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