The Percentage of Minimum Reinforcement

By Aina Parasher|Updated : July 26th, 2022

The percentage of minimum reinforcement of the gross sectional area in slab is

  1. 0.10%
  2. 0.12%
  3. 0.15%
  4. 0.18%

Answer: C. 0.15%

The percentage of minimum reinforcement of the gross sectional area in slab is 0.15%.

Solution

Slab: The minimum percentage of reinforcement is 0.12% of the gross cross-sectional area if HYSD bars(Fe 415) are used. The percentage of minimum reinforcement of the gross sectional area in slab is 0.15% if mild steel bars are used.

A minimum area of reinforcement is required to control the cracking which occurs in the concrete due to temperature, shrinkage, and creep. It enables cracking to be uniformly distributed and therefore minimizes individual crack width. 

The maximum reinforcement in slab is restricted to 1 to 2% of total gross sectional area (B×D), where B is width of slab and D is over all depth of slab including cover.

Column: The percentage of steel should be a minimum of 0.8% of Gross area of the section and maximum of 6% of Gross area of the section.

Beam: As stipulated in the clause. 26.5. 1.1(a) and (b) of IS 456, the minimum amount of tensile reinforcement shall be at least (0.85 bd/fy) and the maximum area of tension reinforcement shall not exceed (0.04 bD). The maximum allowed area of reinforcement is 4% for each tension and compression of its cross-sectional area.

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