# How is two way slab calculated?

## How is two way slab calculated?

If the longer span of the slab is ly and the shorter span is lx, then for a two-way slab, ly/lx is less than 2. If the ratio is greater than 2, it is identified as a one-way slab. The two-way slabs distribute the loads in both directions. Hence, the reinforcement is provided along shorter and longer sides of the slabs.

**Which is better one way slab or two way slab?**

In one way slab main bars are laid along the shorter span and temprature reinforcement or disribution bars along the long span. One way or two way are not designed that any type of them is better than the other but due to change of loading conditions with change of the length breadth ratio of the slab.

### How can I get one way slab?

In the above slab, Larger span/Shorter span = Lx/Ly = 4500/2000 = 2.5 Which is > 2. So it is a one way slab. In this slab, the main reinforcement bars are provided on the shorter side and distribution bars are provided on the longer side.

**Is 456 a one way slab?**

Then compute the value of overall depth (D). Clear cover depends on the exposure condition (for mild exposure, clear cover = 20 mm and for moderate exposure, clear cover = 30 mm )….Steps to design a one way slab.

Type of slab | Span <= 10 m | Span > 10 m |
---|---|---|

Simply supported | 20 | 20 x 10 / span |

## Where is one way slab used?

One-way Ribbed Slab (with beams)system is used for the office buildings (low rise), parking structures, and warehouses.

**What is a 2 way slab?**

The two-way slab is a slab which is generally supported on all sides of walls or beams, and whose length to breadth ratio is less than two and it twists or bends in both direction while transferring the loads to the walls or beams.

### What is a 1 way slab?

The one-way slab is a slab, which is supported by parallel walls or beams, and whose length to breadth ratio is equal to or greater than two and it bends in only one direction (spanning direction) while it is transferring the loads to the two supporting walls or beams, because of its geometry.

**Is 456 a two way slab?**

For obtaining modification factor, the percentage of steel for slab can be assumed from 0.2 to 0.5%. The effective depth d of two way slabs can also be assumed using cl. 24.1,IS 456 provided short span is <3.5m and loading class is <3.5KN/m….b) Depth of slab:

Type of support | Fe-250 | Fe-415 |
---|---|---|

Continuous support | L/40 | L/32 |

## How one way slab is designed?

When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. The load on the slab is carried by the short span in one direction. However main reinforcement bar and distribution bar in transverse direction.