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Maximum spacing of longitudinal bars measured along the periphery the RC column shall not exceed
  • a)
    200 mm
  • b)
    250 mm
  • c)
    300 mm
  • d)
    20 times the diameter of the longitudinal bar
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Maximum spacing of longitudinal bars measured along the periphery the...
As per IS 456: 2000, Clause 26.5.3.1
The spacing of longitudinal bars measured along the periphery of the column shall not exceed 300 mm. In a pedestal of a column, the area of the longitudinal reinforcement shall not be less than 0.15% of the gross area.
Hence the correct answer is option C.
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Maximum spacing of longitudinal bars measured along the periphery the...
Maximum spacing of longitudinal bars in RC column


The maximum spacing of longitudinal bars in a reinforced concrete (RC) column is determined based on several factors such as the column dimensions, the grade of concrete and steel, and the design requirements. The spacing is specified to ensure adequate strength, durability, and performance of the column.


Importance of maximum spacing


The maximum spacing of longitudinal bars is crucial for the following reasons:



  • Structural integrity: The bars provide the primary reinforcement in the column, helping it resist compressive and tensile forces. Proper spacing ensures that the bars are adequately distributed to prevent localized failure.

  • Crack control: The bars also help control cracking in the column by limiting the width and propagation of cracks. Adequate spacing ensures that the bars can effectively distribute and transfer stress, reducing the risk of crack formation.

  • Concrete protection: The spacing of bars affects the cover provided to the concrete, which is essential for protecting the reinforcement from corrosion and fire damage. Proper spacing ensures sufficient cover and minimizes the risk of exposure.



Maximum spacing limit


The maximum spacing of longitudinal bars measured along the periphery of the RC column is specified to be 300 mm.


This means that the distance between adjacent bars, when measured along the circumference of the column, should not exceed 300 mm. If the spacing exceeds this limit, it can compromise the structural integrity, crack control, and concrete protection provided by the reinforcement.


It is important to note that this limit may vary depending on the design codes and standards followed in a specific country or region. However, the specified limit of 300 mm is a common guideline used in many design practices.


Other considerations


In addition to the maximum spacing limit, other factors should also be considered when determining the actual spacing of longitudinal bars in a RC column:



  • Column dimensions: The size and shape of the column influence the spacing requirement. Larger columns may require closer spacing to ensure adequate reinforcement.

  • Load and design requirements: The magnitude and type of loads that the column will be subjected to, as well as the design requirements for strength and serviceability, should be taken into account.

  • Grade of concrete and steel: The strength and properties of the concrete and steel used in the column affect the spacing requirement. Higher strength materials may allow for larger spacing.



By considering these factors and adhering to the specified maximum spacing limit, the design and construction of RC columns can ensure their structural integrity and performance.
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Maximum spacing of longitudinal bars measured along the periphery the RC column shall not exceeda)200 mmb)250 mmc)300 mmd)20 times the diameter of the longitudinal barCorrect answer is option 'C'. Can you explain this answer?
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