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The minimum area of tension reinforcement shall be not less than ______ for design of beam.


1. \(\frac{{0.87\;bd}}{{{f_y}}}\)
2. \(\frac{{0.85\;bd}}{{{f_y}}}\)
3. \(\frac{{0.67\;bd}}{{{f_y}}}\)
4. \(\frac{{0.76\;bd}}{{{f_y}}}\)

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Correct Answer - Option 2 : \(\frac{{0.85\;bd}}{{{f_y}}}\)

Explanation:

Tension reinforcement (As per IS 456: 2000, clause 26.5.1.1):

The minimum area of tension reinforcement should be governed by

\(\frac{{{A_s}}}{{bd}}\; = \frac{{0.85}}{{{f_y}}} \Rightarrow {A_s} = \frac{{0.85 \times bd}}{{{f_y}}}\)

where As = minimum area of tension reinforcement,

b = breadth of rectangular beam or breadth of web of T-beam,

d = effective depth of beam,

fy = characteristic strength of reinforcement in N/mm2

The maximum area of tension reinforcement shall not exceed 0.04 bD,

where D is the overall depth of the beam.

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