What is the Slab?
In reinforced concrete construction, the slab is an
extensively used structural element forming floors and roofs. A concrete slab
is the plane element having the depth d much smaller than its span and width.
It may be supported by reinforced concrete beams, by masonry wall or directly by column. Difference between the oneway slab and twoway slabs are as follows :
What is a Oneway Slab?
Slab supported only on two opposite sides by rigid supports carry the load by flexure in the direction perpendicular to the supports. The plane surface of a predominantly uniformly loaded slab deforms into a cylindrical surface in which curvature and hence bending moment develops only in one direction such slabs are called a oneway slab.What is Twoway Slab?
The rectangular slabs supported on two adjacent, three or four edges, and with the ratio of longer to shorter span less than two, which carry the load by flexure in two perpendicular directions are called twoway slabs.How do You calculate a one way, twoway slab?
If L/b ratio is greater than or equal 2 or then it is
considered a oneway slab.
If L/b ratio is less than 2 then it is considered a twoway slab.
Difference Between One way and Twoway Slab 
Difference Between Oneway Slab and Twoway Slab
S.No

Oneway Slab

Twoway Slab

1

If L/b the ratio
is greater than or equal 2 or then it is considered a oneway slab.

If L/b the ratio
is less than 2 then it is considered a twoway slab.

2

In oneway slab,
the main reinforcement is provided in a short span and distribution reinforcement is provided in a long span.

In twoway slab,
the main reinforcement is provided in both directions.

3

In oneway slab,
the crank is provided in two directions.

In twoway slab,
the crank is provided in four directions.

4

The oneway slab is supported by a beam on two opposite side only.

The twoway slab is supported by the beam on all four sides.

5

In oneway slab,
the load is carried in one direction perpendicular to the supporting beam.

In twoway slab,
the load is carried in both directions.

6

The deflected shape of the oneway slab is cylindrical.

Whereas the
deflected shape of the twoway slab is a dish or saucerlike shape.

7

Chajja and
Varandha are practical examples of oneway slab

Whereas twoway
slabs are used in constructive floors of the Multistorey building.

8

While designing
oneway slab we provide less steel hence the depth of the slab increases, as
a result, the thickness of the oneway slab is more as compared to the
twoway slab.

While designing
twoway slab we provide more steel hence the depth of slab decreases, as a
result, the thickness of twoway slab is less as compared to the oneway
slab.

9

The oneway slab
is economical up to a span of 3.6 meters.

Whereas the
twoway slab is economical for the panel sizes up to 6m × 6m.

10

In oneway slab
quantity of steel is less.

In twoway slab quantity of steel is more as compared to the oneway slab.

11

In oneway slab,
bending is only in one direction i.e. in a shorter span.

In a twoway
slab, bending is in both directions.

 Economy
 Buildability
 Loading condition and
 length of the span
So, friends, I hope I have covered all the differences
between the oneway slab and twoway slab in this article. If you find this article helpful please
be sure to share it with someone who might benefit from it. If you want to add
any information which has missed in this article you can mention it in the
comment section.
Finally, thanks for reading this article.
Finally, thanks for reading this article.
Also, read 
1. How to calculate unit weight of steel bar
2. Bar Bending Schedule  Importance  advantages  Preparation
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