Free Tool · EN 1991-1-4:2005 · No Sign-up

EN 1991-1-4 Wind Load Calculator

Compute v_b, q_p(z), c_pe,10 for wall zones A–E, net pressures w_net, and total horizontal force F_w per EN 1991-1-4:2005. Supports flat, monopitch and duopitch roofs. NL/DE/UK/FR national annexes. No sign-up.

Site & Country

National Annex / country

v_b,0 (m/s) — basic wind velocity

Terrain category (Table 4.1)

Site altitude (m a.s.l.)

Building Geometry

Building height h (m)

Breadth b (m) — perpendicular to wind

Depth d (m) — parallel to wind

Factors & Roof

Roof type

Roof pitch α (°)

Directional factor c_dir

Seasonal factor c_season

v_b

25m/s

q_p(z)

0.864kN/m²

v_m(z)

24.1m/s

I_v(z)

0.197

Total horizontal wind force F_w

230.4 kN

F_w = (w_D − w_E) × h × b [kN per metre run]

BESS container tie-down: F_w on 2.6m × 6m face: 22.46 kN

Intermediate Values

c_r(z) — roughness	0.964
k_r	0.19
z_eff (m)	8
h/d ratio	0.667
c_pi,pos	0.2
c_pi,neg	-0.3

Wall pressure coefficients c_pe,10 (zones A–E)

Zone	c_pe,10	w_net (kN/m²)	Suction / Pressure
A	-1.200	-1.210	Suction (−)
B	-0.800	-0.864	Suction (−)
C	-0.500	-0.605	Suction (−)
D	0.756	0.912	Pressure (+)
E	-0.411	-0.528	Suction (−)

Roof pressure coefficients c_pe,10

Zone	c_pe,10	w_net (kN/m²)	Suction / Pressure
F	-1.800	-1.728	Suction (−)
G	-1.200	-1.210	Suction (−)
H	-0.700	-0.778	Suction (−)
I_pos	0.200	0.432	Pressure (+)
I_neg	-0.200	-0.346	Suction (−)

Export calculation report

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