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In a column, the minimum diameter of the bar to be used is — Answer & Solution | Civexa

RCC Design · Design of Columns

Design of Columns MCQ with answer and solution

In a column, the minimum diameter of the bar to be used is

Solution

Concept

Detailing of column bars (IS 456 cl. 26.5.3)

Step-by-step solution

1. IS 456: longitudinal bars in columns should not be less than 12 mm in diameter.

Explanation

Thin bars buckle easily and are less effective in compression.

Why the other options are wrong

10 mm is below the minimum; 16 and 20 mm are larger than the minimum.

Shortcut

Column bars ≥ 12 mm; at least 4 in a rectangle, 6 in a circle.

Correct answer: B) 12 mm

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