Question

A column of size $300mm\times 300mm$ is provided with minimum steel of minimum diameter as per IS 456 : 2000 guidelines. The number of bars provided will be:

• A. 4
• B. 6
• C. 8
• D. 10

Answer 1

The correct option is C 8

Area of column $=(300{)}^2=90000m{m}^2$
Minimum steel $=0.8$ % of gross area
$=\frac{0.8}{100}\times 90000$
$=720$ $m{m}^2$
Minimum diameter of bar $=12$ $mm$
No.of bars required $=\frac{720}{\frac{\pi }{4}\times {12}^2}=6.36\approx 7$
No.of bars provided $=8$