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## Reinforcement Details In One Way Slab

Before starting one way slab reinforcement let me clear what is one way slab.

When a slab is supported on the two different sides and the ratio of longer span to shorter span is equal to or greater than 2, it will be considered as one way slab. In one way slab, one side is larger than the other one. For example – Verandah slab.

One Way Slab Reinforcement Details:

In one way slab, as one side is greater than the other side, the maximum load is carried by the larger side just so giving main reinforcement comparing to that load carrying side will be adequate.

To provide adequate support on the larger side, the main reinforcement bar is provided perpendicular to that side or parallel to the shorter direction. Distribution bars are provided in the longer direction, which won’t help in carrying any load (refer to below image).

In the above slab, larger span/shorter span = 5000/2000 = 2.5 > 2

So it is a one way slab. As you can see the main bar (greater dia bar) is provided at shorter side and distribution bars are provided at longer side.

One Way Slab Reinforcement Calculation:

For one way slab, main reinforcement is computed by a formula (In limit state design) that is determined by comparing compressive force as well as tensile forces.

Ast = 0.5 Fck/Fu[1-1-2.6Mu/Fck.b.d]b.d

and the distribution steel is computed as

0.15% of Ag, for mild steel.

0.12% of Ag, for tor steel.

Where Ast = Area of the steel in tension.

Fu = Ultimate strength of steel.

Mu = Ultimate moment of resistance.

b = Breadth of the slab section.

d = Depth of the slab section.

Ag = Gross area of the section.

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