Design Requirement of reinforced Concentrate slab

Table Content
1 Effective span for concentrate slab design
2 Limiting stiffness
3 Minimum reinforcement
4 Maximum diameter of bar
5 Distribution reinforcement concentrate for slab design
6 Cover to reinforcement

Let discuss briefly

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1.Effective Span for concrete slab design

For simply supported slab

Minimum of clear span plus effective depth of slab Center to center distance between the supports

For cantilever slab

Length up to face of support+Half the effective depth. Where it forms end of a continuous slab, the length of center of support shall be taken.

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2.Limiting Stiffness

For span up to 10 m, the Basic values of span to depth ration are given below

Cantilevers-7 Simply supported- 20 Continuous- 26

3.Minimum Reinforcement for concrete slab design

As per clause 26.5.2.1 of IS 456-2000, the minimum reinforcement shall not be less than 0.15% of gross sectional if mild steel is used and 0.12% of gross sectional area if HYSD bars are used

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4.Maximum diameter of bars

The diameter of the bar shall not exceed 1/8 of total thickness of the slab.

5.Spacing of main reinforcement

The spacing of main reinforcement in slabs shall not be more than three times the effective depth of solid slab or 300 mm whichever is less

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6.Distribution reinforcement for concrete slab design

The area of distribution reinforcement shall not be less than 0.15%of gross cross-sectional area if plain bars are used and 0.12% of high yield strength deformed bars are used.

The spacing of distribution reinforcement in slabs shall not be more than five times the effective depth of slab or 450 mm whichever is less

7.Cover to reinforcement

The minimum nominal cover provided to slabs is 20 mm.(If the diameter of bar < 12 mm and mild exposure)

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