Wind Loading Calculator

Wind Loading Calculator Tool Input

Building Length (m)
For buildings with duopitch or monopitch roofs, this is the length of the side wall.
Building Width (m)
For building with duopitch or monopitch roofs, this is the width of the gable wall.
Roof Type
Eaves Height (m)
Lower Eaves Height (m)
Roof Slope (Degree)
Negative Internal Pressure Coeff.,C_pi
Default value is taken from BS EN1991-1-4 Clause 7.2.9(6)
Positive Internal Pressure Coeff.,C_pi
Default value is taken from BS EN1991-1-4 Clause 7.2.9(6)
Wind speed, V_b,map (m/s)
See Figure NA.1 of UK National Annex to BS EN1991-1-4
Site Altitude (m)
See NA.2.5 of UK National Annex to BS EN1991-1-4
Seasonal Factor, C_Season
See Table NA.2 of UK National Annex to BS EN1991-1-4
Terrain Type
See NA.2.17 of UK National Annex to BS EN1991-1-4
Pressure Calculation Method
For the 360 degree method you should select the worst value of each parameter in all directions. This approach reduces the number of inputs, but is very conservative. For the quadrant method you should select the worst value of each parameter in the defined quadrants. This approach has more inputs but is less conservative than the 360 degree method. Please see Chapter 3 of The Steel Designers' Manual, 7^th Edition for more information.

Direction	0^o-90^o	90^o-180^o	180^o-270^o	270^o-360^o
Directional Factor, C_dir	0.78	0.8	1	0.99
Closest Distance to Sea (km)
Distance into Town (km)					This is the distance, in Kilometres, from the building to the edge of town.
Distance to Upwind Shelter (m)					This parameter is used to calculate displacement height in accordance with A.5 of BS EN 1991-1-4.
Average Height of Shelter (m)					This parameter is used to calculate displacement height in accordance with A.5 of BS EN 1991-1-4.