Steel Reinforced Concrete Beam and Slab

The concrete belongs to a composite material, a cement matrix with aggregates for reinforcement that has good resistance capacity in compression except for tension.

To resolve this issue, wet concrete is cast across strong, steel reinforcing bars (attached together to form a cage).

When the concrete is set and solidified around the bars, a new composite material alias reinforced concrete is produced. It is also known as reinforced cement concrete or RCC. It is strong against either tension or compression: the concrete withstands squeezing (offers the compressive strength), whereas the steel withstands bending and stretching (offers the tensile strength).

Actually, reinforced concrete employs one composite material inside another so that the concrete turns out to be the matrix when the steel bars or wires arrange the reinforcement.

The steel bars abbreviated as rebar are normally created by twisted strands with nobbles or ridges on them that secure them rigidly inside the concrete devoid of any risk of slipping inside it.

Usually, the steel is applied since it broadens and contracts in the heat and cold roughly to the extent that concrete itself.

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.

Also Read: Beam & Slab Reinforcement Details

Least reinforcement steel is arranged depending on the condition that maximum allowable spacing should remain 5 times the effective depth or 45 cms whichever is lower.

In order to arrange main reinforcement steel, the criteria of max spacing should be 3 times the effective depth or 45 cms whichever is lower.

Maximum diameter of bar in slab should not surpass 1/8″ of total thickness of slab and minimum diameter of bar should be 6 mm. Maximum reinforcement in slab is confined 1 to 2 % of gross sectional area.

There should be 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

Beams
1. Simply supported Beam = Effective Length of Beam/20
2. Continuous Beam = Effective Length of Beam /25
3. Cantilever Beam = Effective Length of Beam /7