Example:
Slab size = 3m×5m
= 15 m square
Slab Thickness = 0.15m or 15cm or 150mm
Concrete density = 2400 kg/meter cube
Steel density = 7850 kg/meter cube
Volume of slab = 0.15×1×1 m square
= 0.15 m cube
= 0.15×2400 kg/m square
= 360 kg/m square
0.8% steel provided to
the total slab volume = (0.8/100)×0.15×7850
= 9.42 kg/m square
Slab self weight = 360+9.42 kg/m square
= 369.42 kg/m square
= 3.69 kN/m square
Live load = 2kN/m square
Dead load = 1 kN/m square
Slab self weight = 3.69+2+1 kN/m square
= 6.69 kN/m square
Total slab self weight = 6.69×15 kN
= 100.35 kN ans.
According to IS-456 2000
Safety of factor = 1.5×load
SOF = 1.5×100.35 kN
= 150.52 kN
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