Difference Between One way and Two way Slab

Difference Between One-way and Two-way 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 one-way slab and two-way slabs are as follows :


One-way 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 one-way slab.

Two-way 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 two-way slabs.


Difference Between One way and Two way Slab

Difference Between One-way and Two-way Slab



S.No.
 One-way Slab
 Two-way Slab
1.
If L/b ratio is greater than or equal 2 or then it is considered a one-way slab.
If L/b ratio is less than or equal 2 then it is considered a two-way 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 one-way slab, the crank is provided in two directions.
In two-way slab, the crank is provided in four directions.
4
One way slab is supported on two opposite site only.
The two-way slab is supported on all four sides.
5
In one-way slab, the load is carried in one direction perpendicular to the supporting beam.
In two-way 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 one-way slab.
7
In one-way slab, bending is only in one direction i.e. in a shorter span.
In a two-way 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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