Question

A reinforced concrete (RC) beam with width of 250 mm and effective depth of 400 mm is reinforced with Fe415 steel. As per the provisions of IS 456-2000, the minimum and maximum amount of tensile reinforcement (expressed in mm${}^2$) for the section are, respectively

• A. 250 and 3500
• B. 205 and 4000
• C. 270 and 2000
• D. 300 and 2500

Answer 1

The correct option is B 205 and 4000

Minimum tensile reinforcement
$=\frac{0.85}{f_y}$

$\frac{Ast}{bd}=\frac{0.85}{415}$

Ast = 204.81 $\approx$ 205 mm${}^2$

$As{t}_{max}=0.04$ of bD

$=\frac{4}{100}\times 400\times 250$

$=4000m{m}^2$