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According to IS 456, when high strength deformed bars are used, the reinforcement shall not be less than p percent of the total cross sectional area of the slab, where p is
1. 0.12
2. 0.15
3. 0.10
4. 0.09
5. 0.16

1 Answer

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Correct Answer - Option 1 : 0.12

Explanation:

CI. 26.5.2 of IS 456:2000 limits minimum steel reinforcement requirements in slabs in either direction as:

Astmin = 0.15% of gross area for Fe 250

Astmin = 0.12% of gross area for Fe 415

 Minimum steel requirements in slab are based on shrinkage and temperature consideration and not on strength consideration because, in slabs, there occurs a better distribution of load effects unlike in beams, where minimum steel requirements are based on strength consideration

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