Minimum Reinforcement in Slabs and Beams

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Minimum Reinforcement in Slabs and Beams

Reinforced Concrete is a concrete in which steel is embedded in such a manner that the two materials act together in resisting forces. The reinforcing steel rods, bars, or mesh absorbs the tensile, shear, and sometimes the compressive stresses in a concrete structure.

When the concrete sets and hardens around the bars, we get a new composite material, reinforced concrete (also called reinforced cement concrete or RCC), that works well in either tension or compression: the concrete resists squeezing (provides the compressive strength), while the steel resists bending and stretching.

Minimum distribution reinforcement steel (for TOR Steel) shall be 0.12% of the overall sectional area. i,e., 0.12 x 100cm x D cm=0.12D Sq.cm for 1 m width of slab where D is the overall depth of slab. Minimum reinforcement is ensured in slab (in both directions) to take care of shrinkage, thermal movements and distribution of loads etc.
Minimum reinforcement steel is provided subject to the condition that maximum permissible spacing shall be 5 times the effective depth or 45 cms whichever is less.
For providing main reinforcement steel, the criteria of max spacing is 3 times the effective depth or 45 cms whichever is smaller
Maximum diameter of bar in slab will not exceed 1/8″ of total thickness of slab and minimum diameter of bar is 6 mm
Maximum reinforcement in slab is restricted 1 to 2 % of gross sectional area.
Minimum Thickness of RCC Slabs and Beams Slabs
Simply supported slab spanning in one direction = Effective Length of Slab /30
Simply supported Slabs Spanning in Two Directions = Effective Length of Slab /35
Continuous Slab Spanning one Direction = Effective Length of Slab /35
Continuous Slab Spanning Two Directions = Effective Length of Slab /40
Cantilever Slab = Effective Length of Slab /12

See More Do’s & Do not’s For Reinforcement Detailing

Beams