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The minimum number of longitudinal bars to be provided as per IS 456 in a circular column shall be
1. 4
2. 5
3. 6
4. 8
5. 10

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Correct Answer - Option 3 : 6

Explanation:

IS 456:2000 Recommendations for the design of columns:

  • Minimum area of steel = 0.8% of total cross-sectional area
  • Maximum area of steel
    • 6% of total cross-sectional area ( when none of the reinforcement is lapped)
    • 4% of total cross-sectional area ( when laps are used for reinforcement )
  • Minimum number of bars
    • Rectangular = 4
    • Circular = 6
  • Maximum spacing of main reinforcement = 300 mm

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