One 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
 |
| 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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