What is Flat Slab with Advantages & Disadvantage - Civil Experience

The term flat slab means a reinforced concrete structure slab with or without drops, supported generally without beams, by columns with or without flared column heads ( IS code 456:2000 cl 31 )

What is the Flat Slab?

Slabs supported directly on columns without beams are known as flat slabs

A flat slab is a two-way reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns

Grid slabs are the slabs in which deep beams are used with closer soacing and columns are omitted

Also Read : Design Two Way Slab

Advantages of flat slab

1. It gives less story height for a given clear height of the floor throughout the same
2. The formwork is simple
3. Construction of a flat slab is simple due to reinforcement detail is simple
4. Speedy Construction so the time required is less
5. It provides a plan ceiling giving an attractive appearance from the architectural point of view
6. Saving in the material of construction
7. More uniform access to daylight and easier accommodation of the various ducts in the building
8. Owner has a wider option for room layout because partition wall used anywhere 
9. Building height can also reduce because beams are eliminated and as a result load of the foundation also reduce
10. Better quality control

Also Read : Design One Way Slab

DisAdvantages of flat slab

1. Omission of the beam yield larger thickness of the slab
2. Spam length is restricted 
3. Lack of resistance to lateral loads such as wind loads and earthquake
4. Reinforcement required in both direction because the flat slab behave like a two-way slab
5. In the construction of the flat slabs the middle strip deflection may be critical
6. Vertical load penetration need to avoid near joint of columns

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