# How do you calculate one way and two way slab?

## How do you calculate one way and two way slab?

How do we calculate a one way or two-way slab? If L/b ratio is greater than or equal 2 or then it is considered a one-way slab. If L/b ratio is less than 2 then it is considered a two-way slab.

## What is 2way slab ratio?

Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along with 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, the load will be carried in both the directions.

**Why we use extra bar in slab?**

Extra Bars:- The extra bar is provided at the bottom of Cranked bars to maintain the framework of the slab. The length of Extra bar is L/4. Deduct the cover for finding length of bar. Compute the Total wt of steel required for slab reinforcement.

**What are the types of two-way slab?**

There are mainly three types of designs for two-way slab.

- Two-way solid slab (with beams) Two-way Solid Slabs on Beams.
- Two-way Waffle Slab (with Beams) Two-way Waffle Slab (with Beams)
- Two-way Waffle Slab (with Integral Beams) Cast in Situ Two-way Waffle Slab with Integral Beams.

### Where is one way slab and two way slab used?

The deflected shape of the one-way slab is cylindrical. Whereas the deflected shape of the two-way slab is a dish or saucer-like shape. Chajja and Varandha are practical examples of one-way slab. Whereas two-way slabs are used in constructive floors of the Multistorey building.

### What is the minimum reinforcement in slab?

Minimum reinforcement is 0.12% for HYSD bars and 0.15% for mild steel bars. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab.

**How do you calculate the number of bars in a slab?**

The quantity is done in two steps.

- (Calculation of Bars No’s) First, calculate the number of bars required (main and distribution both). FORMULA = (Total length – Clear cover)/center to center spacing + 1. Main bar = (5000 – (25+25))/100 + 1.
- (Cutting length) MAIN BAR: FORMULA = (L) + (2 x Ld) + (1 x 0.42D) – (2 x 1d)

**How do you calculate slab depth?**

b) Depth of slab:

- Effective depth d= Span /((L/d)Basic x modification factor)
- 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.

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## What makes a two way slab two way?

Two way slab design Two way slabs are those slab which are supported on unyielding supports on all four sides and the ratio of longer span to shorter span is less than 2. Unyielding support means supports with sufficient stiffness which may either beams or walls. The two way slab design is also designed as explained in IS codes.

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