What is the minimum area of tension reinforcement in beams when Fe 415 is used?

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ESE Civil 2015 Paper 1: Official Paper
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  1. 0.8%
  2. 0.12%
  3. 0.15%
  4. 0.2%

Answer (Detailed Solution Below)

Option 4 : 0.2%
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
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20 Questions 40 Marks 24 Mins

Detailed Solution

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Concept:

As per IS 456 : 2000,

a) Minimum % tension reinforcement:

\({{\rm{p}}_{{\rm{min}}}} = \frac{{0.85}}{{{{\rm{f}}_{\rm{y}}}}} \times 100\% \)

b) Maximum % tension reinforcement:

pmax = 4%of gross area

Calculation:

Minimum percentage of steel (for Fe500)

\({{\rm{p}}_{{\rm{min}}}} = \frac{{0.85}}{{415}} \times 100\%\)

= 0.2%

∴ Minimum percentage of steel (for Fe415) is 0.2
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