EN 1991-1-4 · SP RK EN

Wind on circular cylinders

Reynolds number, force coefficient c_f,0 with surface roughness, and total wind force.

Results

Detailed report

Project Subject Designer Date

About this calculation

Reynolds number, force coefficient c_f,0 with surface roughness, and total wind force.

Design basis

EN 1991-1-4, 7.9.2, 7.13

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
Cylinder: Diameter b; Length l; ze — reference height; Surface roughness k; Apply end-effect factor ψλ (7.13); Structural factor cscd

Output

External pressure coefficients c_pe and pressures by zone
Peak velocity pressure q_p(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 v_b,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, c_pi 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.