Steel quantity calculation excel sheet

Two Way Slab

A slab supported on four adjacent beams with a ratio of longer span to shorter span less than two that carry the load by flexure in both perpendicular directions refers to a two way slab.

If the L/B ( Length/width) ratio is less than two, a two way slab is provided.

Uniformly loaded two way slabs deform into a dish or saucer-like shape, so bending moments develop in both directions.

In two-way slabs, main bars are placed in the shorter as well as longer span with the crank to prevent bending. 

To learn how to calculate the steel quantity for the two way slab, let’s understand this with an example.

Given Data

We have a Two way slab drawing with the following data

Length = 5 Meter

Width = 4 Meter

Main Bar = 12 mm, Spacing – 150 mm c/c, Alternate bent up

Distribution Bar = 10 mm, Spacing – 150 mm c/c, Alternate bent up

Slab Thickness = 150 mm

Clear Cover = 20 mm

Development Length (Ld) = 40d

Step #1 – Bar Numbers

Nos of Bars = Total length/ spacing + 1

Nos of Main bar = 5000/150 +1

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