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The diameter of longitudinal bars of a column should never be less than?

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The diameter of longitudinal bars of a column should never be less than?

(a) 12 mm

(b) 6 mm

(c) 10 mm

(d) 8 mm

The question was asked in an interview for internship.

The query is from Structural Designing and Thumb Rules in division Valuation, Reports Technical and Design Data of Civil Engineering Drawing

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Correct answer is (a) 12 mm

Easiest explanation: Minimum diameter of longitudinal bar in RCC column shall not be less than 12mm (IS456:2000, cl 26.5.3.1 d). Indian standards specify 12mm as the least diameter of a vertical bar and 5mm as the least diameter of lateral bar or stirrup.

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