SSC JE Civil Engineering 2018 Set 4 Solved Paper

Question : 182 of 200

Marks: +1, -0

A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm

^{2}

steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

Solution:

For singly reinforced concrete beam, the depth of neutral axis is
(1/2) B. (X

_a

)

^2

= m. Ast (d – X

_a

)
0.5 × 25. (X

_a

)

^2

= 15 × 18.75 × (70 – X

_a

)
X

_a

= 30cm

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