Design
For a suspended slab, there are a number of designs to improve the strength-to-weight ratio. In all cases the top surface remains flat, and the underside is modulated:
- Corrugated, usually where the concrete is poured into a corrugated steel tray. This improves strength and prevents the slab bending under its own weight. The corrugations run across the short dimension, from side to side.
- A ribbed slab, giving considerable extra strength on one direction.
- A waffle slab, giving added strength in both directions.
Reinforcement design
- A one way slab needs moment resisting reinforcement only in its short-direction. Because, the moment along long axes is so small that it can be neglected. When the ratio of the length of long direction to short direction of a slab is greater than 2 it can be considered as a one way slab.
- A two way slab needs moment resisting reinforcement in both directions. If the ratio of the lengths of long and short side is less than two then moment in both direction should be considered in design.
Read more about this topic: Concrete Slab
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