GATE CE 2017 Set 1 — Question 6
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Structural Engineering → RC Fundamentals & Beams → Limit State Method
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Question
According to IS 456 – 2000, which one of the following statements about the depth of neutral axis for a balanced reinforced concrete section is correct?
Correct answer
(B) x_(u,bal) depends on the grade of steel only.
Solution
According to IS 456:2000, the limiting (balanced) depth of the neutral axis (or ) is derived from the strain compatibility condition at failure. It is given by:where is the yield strength of steel and is the modulus of elasticity of steel ( MPa). This formula shows that the depth depends only on the grade of steel () and is independent of the grade of concrete.
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