About this calculation
Zones F–J for pitches −45…+75°, wind across and along the ridge, positive/negative combinations.
Design basis
EN 1991-1-4, 7.2.5, Tables 7.4a, 7.4b
Input data
- Wind at the site: Site; Kazakhstan wind zone; Fundamental basic wind velocity vb,0; Directional factor cdir; Season factor cseason; Terrain category (Table 4.1); Orography factor c0; Air density ρ
- Building: Length along ridge; Width across ridge; h — height to ridge; Roof pitch α; Wind direction θ
- Coefficients: Loaded area A; Area A
- Internal pressure (7.2.9): Coefficient cpi; cpi,max; cpi,min; Openings in dominant face / other faces; cpe at openings of dominant face
Output
- External pressure coefficients cpe and pressures by zone
- Peak velocity pressure qp(z) with intermediate values
- Zone layout and a detailed PDF, Word, Excel report
FAQ
Where do I get the basic wind velocity for Kazakhstan?
Start typing a settlement name — the wind zone and vb,0 are filled from the SP RK EN 1991-1-4 map. The zone map is also available as a separate page.
Is internal pressure included?
Yes, cpi per 7.2.9; internal pressure is given as a separate load and is not added to the external pressure.
Can the report be used in a design?
The report shows formulas, substitutions and clause references. Check national parameters against the current National Annex; the designer is responsible for the result.