SLAB DEFINITION,TYPS OF SLAB & DIFF B/W ONE WAY SLAB ,TWO WAY SLAB

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SLAB:

• A slab is structural element whose thickness is small compared to its own length and width.

• Slabs in buildings are usually used to transmit the loads on floors and roofs to the supporting beams.

TYPES OF SLABS:

• One-Way Slab
• Two-Way Slab
• Flat Plate
• Flat slab
• Grid or waffle slab

ONE WAY SLAB:

• A one way slab is simply a very wide beam that spans between supports.
• When Slab is supported on two opposite sides only,total load is carried along the perpendicular direction of supporting beams.
• When slab is Supported at all sides and length/Width>2 of a slab panel,maximum load is carrying along the short direction.
• Main reinforcement is Placed along the load carrying direction.

• A One way slab is supported by parallel walls or beams ,and the main tension reinforcing bars run parallel to the span .It looks like the following.

Example: Generally all the Cantilever slabs are one Way slab. Chajjas and verandahs are an 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 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, load will be carried in both the directions. So, main reinforcement is provided in both direction for two way slabs.

Example: These types of slabs are used in constructing floors of multi storeyed building.

Difference between One Way Slab and Two way slab:

One Way Slab	Two Way Slab
Slabs are supported by the beams on the two opposite sides	Slabs are supported by beams on all the four sides.
Main reinforcement is provided on shorter span due to bending	Main reinforcement is provided in both sides due to bending occurs on both sides
Main Reinforcement is provided in only direction for one way slabs	Main Reinforcement is provided along both the directions in two way slabs.
Loads are carried along one direction in one way slab.	Loads are carried along both the directions in two way slabs.