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Overview: Difference Between One Way Slab and Two Way Slab

One Way Slab

Overview: Difference Between One Way Slab and Two Way Slab
Illustration of a one way slab
One way slab is supported on two opposite side only thus structural action is only at one direction. Total load is carried in the direction perpendicular to the supporting beam. If a slab is supported on all the four sides but the ratio of longer span (l) to shorten span (b)  is greater than 2, then the slab will be considered as one way slab. Because due to the huge difference in lengths, load is not transferred to the shorter beams. Main reinforcement is provided in only one direction for one way slabs.

Two Way Slab

Overview: Difference Between One Way Slab and Two Way Slab
Illustration of a two way slab
Two way slabs are the slabs that are supported on four sides and the ratio of longer span (l) to shorter span (b) is less than 2. In two way slabs, load will be carried in both the directions. So, main reinforcement is provided in both direction for two way slabs.

Difference Between One Way Slab and Two Way Slab

There are some basic differences between one way slabs and two way slabs. To clear the concept of one way and two way slabs a table is shown below.

One Way Slab

Two Way Slab

One way slab is supported by beams in only 2 sides. Two way slab is supported by beams in all four sides.
The ratio of longer span panel (L) to shorter span panel (B) is equal or greater than 2. Thus, L/B >= 2 The ratio of longer span panel (L) to shorter span panel (B) is less than 2. Thus, L/B < 2.
Main reinforcement is provided in only one direction for one way slabs. Main reinforcement is provided in both the direction for two way slabs.

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