Example:
Column size = 300mm×450mm
Beam size = 250mm×450mm
Wall thickness = 200mm
Slab thickness = 150mm
(i) column load calculation
Column height =3.1m
Column volume = 0.3×0.45×3.1
= 0.418 meter cube
= 0.418×2400 kg
= 1003.2 kg
(Unit weight of concrete = 2400 kg/meter cube )
1% steel provided of column total volume
=(1/100)×0.418×7850 kg
=32.8 kg
(unit weight of steel = 7850 kg/meter cube)
Total weight of one column = 1003.2+32.8 kg
= 1036 kg
= 10.36 kn
(ii) beam weight calculation
Volume = 0.25×45×1
=0.1125 meter cube
= 0.1125×2400 kg
= 270 kg/meter
2% steel provided of beam total volume
= (2÷100)×0.1125×7850 kg
= 17.66 kg
Total weight of beam = 270+17.7 kg
= 287.7 kg/m
=2.87 kn/m
Total beam length = (12.4×3)+(7.5×4) m = 67.2 m
(iii) brick wall weight calculation
Volume = 0.2×1×3.1
= 0.62 meter cube
= 0.62×2000 kg
= 1240 kg/m
= 12.4 kn
(Unit weight of bricks 1600 to 2000 kg/m cube)
Total length of wall = (12.4×2)+(7.5×3)+ (6×3)+8+3.1
= 76.4 m
(iv) slab weight calculation
Volume = 0.15×1×1 m cube
= 0.15 m cube
= 0.15×2400 kg/m square
= 360 kg/m squar
0.8% steel provided of slab total volume
= (0.8÷100)×0.15×7850 kg
= 9.42 kg/m square
Total slab weight = 360+9.42 kg
= 369.2 kg/m square
= 3.69 kN/m square
For floor finish = 1 kN/m square
For live load = 2 kN/m square
Total slab weight = 3.69+1+2
= 6.69 kN/m square
= 7 kN/m square
According to IS-456 2000
Safety of factor = 1.5
Total building load = 1875.8 kn
Fos = 1875.8×1.5 kn
= 2813.7 kn ans.
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