Question:
The minimum diameter of longitudinal bar in a column is
The minimum diameter of longitudinal bar in a column is
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Reinforce your memory of the basic reinforcement rules for columns from IS 456:
- Min. number of bars: 4 in rectangular, 6 in circular.
- Min. bar diameter: 12 mm.
- Min. steel percentage: 0.8% of gross area.
- Max. steel percentage: 6% of gross area (4% if lapped).
- Min. number of bars: 4 in rectangular, 6 in circular.
- Min. bar diameter: 12 mm.
- Min. steel percentage: 0.8% of gross area.
- Max. steel percentage: 6% of gross area (4% if lapped).
Updated On: Jul 1, 2026
- 6 mm
- 8 mm
- 12 mm
- 16 mm
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks for the minimum diameter of the main longitudinal reinforcement bars that can be used in an RCC column, as per IS 456.
Step 2: Detailed Explanation:
This is a repeat of question 153.
According to IS 456:2000 (Clause 26.5.3.1c), the code specifies requirements for the reinforcement in columns to ensure proper construction, stiffness, and load-carrying capacity.
The clause states that the diameter of the longitudinal reinforcement bars in a column shall not be less than
12 mm.
This rule is in place to ensure that the bars are stiff enough to resist buckling between the lateral ties during construction and under load, and to provide adequate dowel action at splices. Using bars smaller than 12 mm would make the column's reinforcement cage too flexible.
Step 3: Final Answer:
The minimum diameter of a longitudinal bar in a column is 12 mm.
The question asks for the minimum diameter of the main longitudinal reinforcement bars that can be used in an RCC column, as per IS 456.
Step 2: Detailed Explanation:
This is a repeat of question 153.
According to IS 456:2000 (Clause 26.5.3.1c), the code specifies requirements for the reinforcement in columns to ensure proper construction, stiffness, and load-carrying capacity.
The clause states that the diameter of the longitudinal reinforcement bars in a column shall not be less than
12 mm.
This rule is in place to ensure that the bars are stiff enough to resist buckling between the lateral ties during construction and under load, and to provide adequate dowel action at splices. Using bars smaller than 12 mm would make the column's reinforcement cage too flexible.
Step 3: Final Answer:
The minimum diameter of a longitudinal bar in a column is 12 mm.
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