## What is design of flat slab?

## What is design of flat slab?

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. The flat plate is a two-way reinforced concrete framing system utilizing a slab of uniform thickness, the simplest of structural shapes.

## What are the methods of design of flat slab?

There are two methods of analysis of RC flat slab viz. Direct Design Method and Equivalent Frame Method.

**How are flat slabs constructed?**

Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Flat slab is defined as one sided or two-sided support system with sheer load of the slab being concentrated on the supporting columns and a square slab called ‘drop panels’.

### What is the maximum span for flat slab?

Theoretically there is no limit on maximum length. But practically and economically they are restricted. A flat slab between span of 6.0 to 9.0m is economically feasible.

### What is the thickness of flat slab?

The appropriacy of thickness has to be determined for shear and bending moments. The flat slab should have a minimum thickness of 125 mm.

**Is code for design of flat slabs?**

Design of flat slabs by IS: 456 The term flat slab means a reinforced concrete slab with or without drops, supported generally without beams, by columns with or without flared column heads (see Fig.

#### What are the methods of design of flat slabs as per IS 456 2000?

As per cl. 31 of IS456-2000, the span by depth ratio of two way slab is applicable for flat slabs and the values can be (l/d)modified by 0.9 for flat slabs with drops. As per ACI -The drop thickness should not be less than 100mm or (Thickness of slab)/4. While calculating span by depth ratio, longer span is used.

#### Where flat slab is used?

Uses Of Flat Slab:

- Flat slabs are mostly used in large industrial structures, parking garages, ramps, warehouse, high rise buildings and hotels.
- They are also used where uses of beams are not required.
- Or where the structure requires less formwork.

**What is Direct Design Method?**

The direct design method is an analytical approach by which the required area of reinforcement for short reinforced concrete columns or shear walls is determined directly without using an interaction diagram.

## Is 456 flat slab design?

Design of flat slabs by IS: 456 The term flat slab means a reinforced concrete slab with or without drops, supported generally without beams, by columns with or without flared column heads (see Fig. 12).

## What is the minimum thickness of flat slab?

125 mm

The minimum thickness of Flat slab shall be 125 mm.