ROOF
DEAD LOAD CALCULATIONS
ULS AND SLS
ROOF 1
Dead load consists of two different load sources: the structure itself, and the weight of the roof layers. The load of the structure is calculated by the Autodesk Robot itself.
The snow load is directly dependant on two coefficients: exposure and thermal, and the characteristic value of the snow load.
μi = 0 s = 0kN/m2
ROOF 2 μi = 0.8(60-a)/30 μi = 0.8(60-45)/30 = 0.8 * 0.5 = 0.4 s = 1.2 * 0.4 * 3 = 1.44 kN/m2
ROOF 3 μi = 0.8 s = 1.2 * 0.8 * 3 = 2.88kN/m2
CALCULATIONS OF THE ROOF LAYERS
SHINGLES 4.5cm shingles (3 layers of 1.5 cm) – 4.2kN/m3 – 0.045 * 4.2 = 0.189kN/m2 WOODEN UNDERSTRUCTURE FOR SHINGLES 2.5cm - covers around 50% of area - 4.2kN/m3 – 0.025 * 0.5 * 4.2 = 0.0525 kN/m2 OSB BOARDS 2cm – 6.3kN/m3 – 0.02 * 6.3kN/m3 = 0.126kN/m2 INSULATION 33cm (3 different layers of different thicknesses) – 0.3kN/m3 – 0.33 * 0.3 = 0.099kN/m2 WOODEN UNDERSTRUCTURE FOR ACOUSTIC BOARD 2cm - covers around 40% of area - 4.2kN/m3 – 0.02 * 0.4 * 4.2 = 0.0336 kN/m2 WOODEN BOARD 3cm - 4.2kN/m3 – 0.03 * 4.2 = 0.126kN/m2 TOTAL = 0.6261kN/m2
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