Difference Between Oneway and Twoway 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 :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 oneway slab.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.Difference Between Oneway and Twoway Slab
S.No.

Oneway Slab

Twoway Slab

1.

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 or equal 2 then it is considered a twoway slab.

2

In one way slab, the main reinforcement is provided in one direction.

In two way slab, the main reinforcement is provided in two directions.

3

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

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

4

One way slab is supported on two opposite site only.

The twoway slab is supported 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

In one way slab quantity of steel is less.

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

7

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

In a twoway slab, bending is in both directions.

8

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

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

Also, read How to calculate unit weight of steel bar
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