# What Is One-Way Slab? What is Two Way Slab? Difference Between One way and Two-way Slab | One-Way Slab & Two-way Slab Reinforcement

## One-Way Slab

What Is One-Way Slab?

One way slab is a slab that is supported by beams on the two opposite sides to carry the load in one direction.

When the moment in the long axis is negligible, a one-way slab with moment-resisting reinforcement is used. Examples of one-way slab designs are the corrugated slabs and ribbed slabs.

Non-reinforced slabs can also be deemed one-way if they are solely supported on two opposed sides (i.e., they are supported in one axis).

Depending on the type of load, a one-way reinforced slab may be stronger than a two-way non-reinforced slab.

The computation of reinforcing requirements for a one-way slab can be highly tedious and time-consuming, and the ideal design is never absolutely definite.

Even small project changes may need a recalculation of the reinforcing requirements. Many issues must be considered while designing the structural construction of one-way slabs, including:

2. Bending moment calculation
3. Acceptable depth of flexure and deflection
4. Type and distribution of reinforcing steel

## A Two-Way Slab

What is Two Way Slab?

A two-way slab is a slab that is supported by beams on all four sides of the slab to carry the load in both directions.

Moment-resisting reinforcement is present in both directions of a two-way slab. This could be done because of application requirements such as severe loading, vibration resistance, clearance beneath the slab, or other causes.

The ratio of the two horizontal lengths, on the other hand, is an important feature determining the requirements of a two-way slab. If the ratio of longer to shorter span less than two, then moment in both directions should be considered in design.

A two-way non-reinforced slab is one that is supported in both horizontal axes.

## Difference Between One way and Two-way Slab

• The one-way slab is supported by a beam on two opposed sides only while the beam on all four sides supports the two-way slab.
• The load is carried in a single direction perpendicular to the supporting beam in a one-way slab while the loads is transmitted in both directions by a two-way slab.
• When the Length/width ratio is less than 2, it is considered a two-way slab. When the Length/width ratio is higher than or equal 2 then one-way slab is considered.
• The main reinforcement is provided in a short span and the distribution reinforcement is delivered in a long span in a one-way slab. The major reinforcement of a two-way slab is provided in both directions.
• The number of reinforcement steel in a two-way slab is more than in a one-way slab.
• Bending in a one-way slab occurs only in one direction, while b ending can occur in both directions in a two-way slab.

# One way and Two-way Slab FAQs

What is the difference between a one-way slab and a two-way slab?

As you know that a one-way slab is a slab that is supported by beams on the opposite sides to carry the load in one direction only whereas the two-way slab supports the load over two directions.

What is the ratio of width/length in a two-way slab?

The Length: width =Less than 2 then it is considered a two-way slab.

What is the ratio of length/width in a one-way slab?

The Width: length = 1: 2 or more

Is there a difference between a one-way slab and a two-way slab in reinforcement requirement?

Yes, there is a difference between one-way and two-way slab reinforcement details. Reinforce of the one-way slab is provided in one direction only, whereas in a two-way slab reinforcement requirement is provided for both directions.

Which is the span one-way slab or two-way slab?

For a span of up to 3.6 meters, the one-way slab is cost-effective. The two-way slab, on the other hand, is cost-effective for panel sizes up to 6M square.

The amount of steel used in a one-way slab is minimal. The quantity of steel in a two-way slab is greater than in a one-way slab.

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