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- Process to calculate wind actions
- Wind structural factor cscd
- Wind zones France
- Wind zones Switzerland (SIA)
- Wind zones Belgium
- Wind zones UK
- Orography factor
- Terrain categories

- Snow zone per commune in France
- Snow zone in Switzerland (SIA)
- Snow zone in Belgium
- Snow zone in UK
- Eurocode Snow loads

Eurocode General procedure

- Seism zone France
- Seism zone Switzerland (SIA)
- Seism zone Belgium
- Seism zone United Kingdom
- Seismic importance class
- Eurocode Seismic actions General procedure

- Eurocode Permanent loads and storage loads

densities by material - Eurocode Imposed loads

tables by usage

- Eurocode Materials
- Eurocode Steel structures EN1993 General rules
- Eurocode Timber structures EN1995 General rules
- Cold rolled steel structures

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Wind zones map in Switzerland

With Lisa.blue, get your SIA wind zone immediatly

In Switzerland, wind regions vary from zone 0.9 (lowest) to zone 3.3 (highest).

These zones indicate the variation of the reference value of the dynamic pressure in kN/m².

Wind zones | Jura | General | Alps | ||||
---|---|---|---|---|---|---|---|

Reference value of the dynamic pressure in kN/m² | 2.4 | 0.9 | 1.1 | 1.3 | 1.1-2.7 | 1.4-3.3 | 3.3 |

The building is located in wind zone 1.1. ##### Wind standard

##### Reference value of the dynamic pressure

##### Fundamental values of the basic wind velocity

##### Basic wind velocity v_{b} on the building site during a period of 50 years

###### Probability coefficient of exceeding

###### Directional factor of wind

###### Season factor

##### Peak velocity pressure q_{p}

##### Maximum equivalent peak wind velocity (at the ridge Lvl +7.5 m)

The standard applicable for wind load calculation on this building is SIA 261:2020 §6 (08/2020) and its annex Annexe E (08/2020).

The reference value of the dynamic pressure, q_{p0}, corresponds to the peak speed (wind gusts of a few seconds) , at 10 m above ground level in terrain of 'open country' (category III) type.

The fundamental values of the dynamic pressure are specified by the Annex E.

This one provides a country map divided into climatic zones.

For the zone 1.1, the specified value of the pressure is: q_{p0} = 1.1 kN/m².

The fundamental values of the dynamic pressure are specified by the Annex E.

This one provides a country map divided into climatic zones.

For the zone 1.1, the specified value of the pressure is: q

The fundamental value of the basic wind velocity, v_{b0}, is deduced from the reference value of the dynamic pressure and from the density of the air.

The density of the air for a building located at an altitude of 1278 m..

(Swiss Federal Office of Energy, 1999: Planning of Wind Power Plants - Guide for Switzerland).

The relation between the dynamic pressure q_{p0} and the basic wind velocity v_{b0} is :

The basic wind velocity v_{b0} is therefore :

The density of the air for a building located at an altitude of 1278 m..

(Swiss Federal Office of Energy, 1999: Planning of Wind Power Plants - Guide for Switzerland).

The relation between the dynamic pressure q

The basic wind velocity v

The probability *p* of exceedance is considered on the useful life of the project, itself based on the use of the project.

For our building project, the use is dwelling house, the recommended duration of use, necessary for determining the return period, is therefore 50 years.

The 10 minutes mean wind velocity having the probability*p* for an annual exceedence is determined by multiplying the basic wind velocity v_{b} by the probability factor of severe wind c_{prob}:

(Not referenced by SIA standards - Application of EN 1991-1-4 Equation 4.2)

For our building project, the use is dwelling house, the recommended duration of use, necessary for determining the return period, is therefore 50 years.

The 10 minutes mean wind velocity having the probability

(Not referenced by SIA standards - Application of EN 1991-1-4 Equation 4.2)

'wind direction' means the direction from which the wind comes.

The SIA standard does not mention a wind direction coefficient to reduce the resulting pressures. We therefore assume that c_{dir} = 1.

The SIA standard does not mention a wind direction coefficient to reduce the resulting pressures. We therefore assume that c

The SIA standard does not mention a season factor coefficient to reduce the resulting pressures. We therefore assume that c_{season} = 1.

The basic wind velocity is therefore

(Not referenced by SIA standards - Application of EN 1991-1-4 Equation 4.)

(Not referenced by SIA standards - Application of EN 1991-1-4 Equation 4.)

For each surfaces of the building, wind effects are observed in 4 nominal angular sectors of 90°:

- the highest basic wind velocity v
_{b}contained in each of its sectors is retained - it is then adjusted taking account of the impact of terrain roughness on the variability of the mean wind velocity.
- the peak velocity pressure q
_{p}is finally calculated with taking account of the density of air and the rapid fluctuations in velocity.

- 174 km/h to control the vibrations and the deformations of the structure at serviceability limit states (SLS).

- 213 km/h to control the resistance of the structure at ultimate limit state (ULS).

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