Design instructions for floor slab of thickness S=20 cm
Height of cast beam in factory and weight=
5 cm – (0,016×2500) = 40 kg/m²
Weight of panel produced in factory
n° 4 x 20 = 80 + 40 = 120 kg/m²
Volume of concrete for completion
0,02 + 0,015 (filling of elements in wood) + 0,040 (concrete slab thickness cm 4) = 0,075 mc/m²
Weight of concrete for completion
0,075 x 2.400 = 180 kg/m²
Total own weight of completed floor slab
40 + 80 + 180 = 300 kg/m²
Total bearable load besides own wieght
Gap Reinforcement for bending in the hypothesis of supported ends
(m) 300 kg/m² 400 kg/m² 500kg/m² 600 kg/m² 700 kg/m²
3.00 1Ø8 1Ø10 1Ø10 1Ø12 1Ø12
4.00 1Ø12 1Ø14 1Ø10+1Ø12 1Ø16 2Ø12
5.00 1Ø16 1Ø12+1Ø14 1Ø12+1Ø16 1Ø14+1Ø16 2Ø16

The above table has been compiled on the basis of the usual criteria of resistance, considering materials with the following characteristics:

concrete mix: C 25/30 fyk 25N/mm²
steel: B450c

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