One Way Slab Vs. Two Way Slab ( Difference Between One Way Slab and Two Way Slab )

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This article clearly describes One Way Slab Vs. Two Way Slab, in other words, carries detailed information about the Difference Between One Way Slab and Two Way Slab.

Steel-reinforcement slabs, with thicknesses ranging from 100 to 500 mm, are commonly used for constructing floors and ceilings.



1. One-Way Slab  

The one-way slab can be defined as the type of slab in which the ratio of the longer to the shorter span is more than two.


(Longer Span / Shorter Span) ≥ 2

One  Way Slab

The shorter span of the one-way slab is provided with the primary reinforcement, while the longer span is provided with the distribution reinforcement.

Some prominent examples of one-way slabs are the cantilever slabs, chajjas, and verandahs.



2. Two Way Slab  

In a two-way slab, the longer to the shorter span ratio is less than two. i.e.

( Longer Span/Shorter Span) <2

The load is carried in both directions in a two-way slab. So, the main bars are provided in both directions.

Two-way slabs are extensively used in multi-story and commercial buildings.

two way slab

There are three common types of two-way slabs. They are:

Type of Two-Way SlabApplicationsSpan CapabilityRib/Waffle SystemWeightModular Suitability
Two Way Solid Slab (with beams)Versatile, Large-scaleWide RangeNoneHeavierLess Suitable
Two-Way Waffle Slab (with beams)Offices, Warehouses, ParkingModerate SpansWaffle SystemLighterSuitable (Low-rise)
Two-Way Waffle Slab (with Integral Beams)Modular ConstructionsLarger SpansWaffle SystemModerateSuitable




3. One Way Slab Vs. Two Way Slab  

The difference between a One-way slab and a Two-way slab is as follows:

CharacteristicOne-Way SlabTwo-Way Slab
DefinitionThe ratio of longer to shorter spans is more than two.The ratio of longer to shorter spans is less than two.
Bending momentOccurs in one direction only.Occurs in two perpendicular directions.
L/B ratioGreater than 2.Less than 2.
CrankReinforcement cranked in one direction (perpendicular to supporting beams)Reinforcement cranked in two directions (both longer and shorter spans)
Primary reinforcementProvided primarily in one direction (perpendicular to supporting beams)Provided in both directions.
SupportThey are supported by a beam on two opposite sides only.Beams on all four sides support them.
Load carryingThe load is carried in one direction perpendicular to the supporting beam.The load is carried in both directions.
EconomyEconomical up to a span of 3.6 meters.Economical for panel sizes up to 6m x 6m.
Quantity of steelLess.More.
ApplicationsCulverts, bridges, etc.Residential buildings, water tanks, etc.


Read Also: Two-Way Slab
Verified Article By Er. Madhu Krishna Poudel
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