Built up area = 39.372 ft ×39.372 ft
Column size = 300mm×300mm
Beam size = 250mm×375mm
Column height = 3.1 m
Concrete density = 2400 kg/m cube
Steel density = 7850 kg/m cube
Slab thickness = 150mm
(i) column self weigh = 0.3×0.3×3.1 m cube
= 0.279 m cube
= 0.279×2400 kg
= 669.6 kg
1% steel provided to the total column volume = (1/100)×0.279×7850
= 21.9 kg
column self weight = 669.6+21.9 kg
= 692 kg
= 6.92 kN
= 7 kN
(ii) beam self weight = 0.25×0.375×1
= 0.09375 m cube
= 0.09375×2400 kg
= 225 kg
2% steel provided to the
total beam volume=(2/100)×0.09375×7850kg
= 14.71 kg/m
beam self weight = 225+14.71 kg
= 240 kg
= 2.4 kN/m
(iii) slab self weight = 0.15×1×1 m cube
= 0.15 m cube
= 0.15×2400 kg
= 360 kg
0.8% steel provided to the total slab volume
= (0.8/100)×0.15×7850 kg
= 9.42 kg
Slab self weight = 360+10 kg
= 370 kg
= 3.7 kN
Floor finish load = 1kN/m square
Live load = 2 kN/m square
Slab self weight=3.7 +1+2 kN
= 6.7 kN/m square
= 7kN/m square
Total load acting on the foundation in one column = 7+(2.4×8)+(7×16) kN
= 138.2 kN/column ans.
With safety factor = 138.2×1.5 kN
= 207.3 kN/column.
Note: for more information about this topic watch video link below.
https://youtu.be/4YQSUaonoiE
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