For a beam, if d = effective depth, b = width and D = overall depth, then the maximum area of compression reinforcement in a beam is:

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  1. 0.04bd
  2. 0.04bD
  3. 0.12bd
  4. 0.12bD
  5. 0.08bd

Answer (Detailed Solution Below)

Option 2 : 0.04bD
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OSSC Combined Technical Services: Full Test 1
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Detailed Solution

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Explanation:

  • Excessive reinforcement leads to congestion of bars which adversely affects the placement and compaction of concrete.
  • CI. 26.5.1.2 of IS 456:2000 limits the maximum area of steel reinforcement in tension (Astmaxand compression (Ascmax) to 4% of gross area i.e. 0.04bD.

Important Points 

Some other provision is given by IS 456:

  • The minimum area of tensile reinforcement = ">Astbd=0.85fyAstbd=0.85fy=0.85�����=0.85��
  • Nominal cover =  25 mm
  • Ultimate tensile strain in steel is in the range of = 0.12% to 0.2%

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