Difference between One Way Slab and Two Way Slab?




One Way Slab:

One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The ratio of longer span (l) to shorter span (b) is equal or greater than 2, considered as One way slab because this slab will bend in one direction i.e in the direction along its shorter span. Due to the huge difference in lengths, the load is not transferred to the shorter beams. Main reinforcement is provided in shorter span and distribution reinforcement in a longer span.



Generally all the Cantilever slabs are one Way slab. Chajjas and verandahs are a practical example of one way slab.


Two Way Slab:

Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along with both directions, it is known as two way slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2.In two way slabs, the load will be carried in both the directions. So, the main reinforcement is provided in both directions for two way slabs.



These types of slabs are used in constructing floors of a multi-storeyed building.



One way Slab reinforcement details:-



Two way Slab reinforcement details:-




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