SSC JE Civil Engineering 29-Oct-2020 Shift 1 Paper

Question : 116 of 200

Marks: +1, -0

Reinforcement provided in a rectangular RCC beam of effective depth 500 mm is such that actual depth of neutral axis is at 300 mm from extreme compression fibre. Fe 415 steel is used and provided on tension face only. It is a:

doubly reinforced section
over reinforced section
under reinforced section
balanced section

Validate

Solution:

Given:

x_4

= 300 mm, d = 500 mm
Fe 415 steel ⇒ fy = 415

\N\/\mm^2

{{{x_4}\;\lim}}/{d} = ( {{{700}}/{{1100 \;+\; 87.415}}} ) = .479

⇒ x_4 \lim = 0.479 × 500

= 239.55 mm
Since

x_4 > x_4 \lim

⇒ section is over-single C/d.

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