building load calculation of G+1 easily

building load calculation involves calculating dead load of each element as well as live load and other load considerations like earthquake load, snow load, wind load, etc. according to the type of structure and its location.

Here,

we will take a simple example of a room and we will calculate the total load of a structure including slab, beam , wall, column & footing

building load calculation

Given,

slab thickness = 150mm

wall thickness = 150mm

wall height = 3000mm

beam size = (250×200)mm

column size = (300x300x3000)mm

footing size = (1500x1500x300)mm

depth of column below ground level = 1500mm

floor finish load = 1.5KN/m^2

water proofing load = 1KN/m^2

live load = 2KN/m^2

outer plaster thickness = 12mm

inner plaster thickness = 10mm

rcc density = 25KN/m^3

brick density = 19KN/m^3

plaster density = 21KN/m^3

load calculation formula = mass = volume * density

slab load –

for one way

  • W*Lx/2

for two way

  • triangular portion = W*Lx/3
  • trapezoidal portion = (W*Lx)/2(1-(1/2#))

where,

# = Ly/Lx

Solution

first,

we need to convert imperial unit to metric unit

Slab load calculation

length (Ly) = 13′ = 3.962m

width (Lx) = 11′ = 3.353m

Ly/Lx = 3.962/3.353 = 1.182 < 2, it is slab is two way slab

in the case of two way slab, the load load is divided into two loading patterns triangular along shorter span and trapezoidal along longer span

thickness = 6″ = 150mm

Dead load = thickness*rcc density

rcc density = 25KN/m^3

slab load = 0.15*25 = 3.75KN/m^2

Total load on slab = slab load + floor finish load + water proofing load + live load

= 3.75+1.5+1+2 = 8.25KN/m^2

Factored load (W) = 1.5*8.25 = 12.375KN/m^2

triangular load = W*Lx/3 = 12.375*3.353/3 = 13.831KN/m

trapezoidal load = (W*Lx)/2(1-(1/2#)) = (12.375*3.353)/2(1-(1/2*1.182)) = 35.905KN/m

Total load = 13.831+35.905 = 49.736KN/m

Total Slab load in KN = 49.736*3.962 = 197.054*2 = 394.108KN

Beam load calculation

beam1 length = 12′ = 3.657m

beam2 length = 14′ = 4.267m

beam size = (0.25×0.2)m

load = 0.25*0.2*25 = 1.25KN/m

fatored load = 1.5*1.25 = 1.875KN/m

load of all four beams in KN –

beam 1 = 1.875*3.657 = 6.857KN

beam 2 = 1.875*4.267 = 8KN

Total load = (2*6.857)+(2*8) = 29.714KN

Wall load calculation

Wall1 length = 12’4″ = 3.757m

Wall2 length = 10’4″ = 3.148m

load = 0.15*3*19 = 8.55KN/m

fatored load = 1.5*8.55 = 12.825KN/m

load of all four walls in KN –

wall 1 = 12.825*3.757 = 48.184KN

wall 2 = 12.825*3.148 = 40.373KN

Total load = (2*48.184)+(2*40.373) = 177.114KN

Plaster load calculation

plaster area = 3x(0.012+0.01) = 0.066m^2

load = 21*0.066 = 1.386KN/m

fatored load = 1.5*1.386 = 2.079KN/m

plaster load on all four walls in KN –

wall 1 = 2.079*3.757 = 7.81KN

wall 2 = 2.079*3.148 = 6.545KN

Total load = (2*7.81)+(2*6.545) = 28.71KN

Column load calculation

column size = (0.3×0.3)m

load = 0.3*0.3*25 = 2.25KN/m

factored load = 1.5*2.25 = 3.375KN/m

Total dead load of column in KN = 3.375*3*4 = 40.5KN

Footing load calculation

footing size = (1.5×1.5)m

load = 1.5*1.5*25 = 56.25KN/m

factored load = 1.5*56.25 = 84.375KN/m

Total dead load of footing in KN = 84.375*0.15*4 = 50.625KN

Sl. No.ElementLoad (KN)
1Slab394.108
2Beam29.714
3Wall177.114
4Plaster28.71
5Column40.5
6Footing50.625
7
Total load of structure720.771

Note

here we have taken a simple example to calculate load of a structure and its a approximate calculation, accurate calculation needs more detailed calculation, other factors like earthquake load, wind load , snow load. etc., and more expertise.

we also need soil analysis report and knowledge of load distribution in a structure.

overall, here we have just calculated dead load of each element, but to design a structure properly we take other considerations into account.

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