Calculations › Wind Loading
Wind Loading
EN 1991-1-4
Determines design peak wind pressure on a building to EN 1991-1-4 using the UK or Irish National Annex.
Diagram
Example inputs
Building length (d, wind dir.)10 m
Building width8 m
Building height6 m
Terrain category2
Altitude0 m
UK wind zoneB
Building typeenclosed
National annexUK
Results
Wind Loading
EN 1991-1-4 · UK Zone B · TC2 · H=6m
Results
✓ Basic Velocity (vb) PASS
util 0.0024.00EN 1991-1-4 §4.2 + UK NA §NA.2.5
| vb,0 fundamental basic wind velocity | 24 | m/s | UK NA Figure NA.1 |
| Altitude | 0 | m | |
| calt altitude factor = 1 + 0.001 × A | 1 | — | UK NA §NA.2.5 |
| vb basic wind velocity = vb,0 × calt | 24 | m/s | EN 1991-1-4 §4.2 |
✓ Peak Pressure (qp) PASS
util 0.000.38EN 1991-1-4 §4.5
| ze reference height | 6 | m | |
| ce(ze) exposure factor | 1.06 | — | EN 1991-1-4 Figure 4.2 |
| qb basic velocity pressure = 0.5 × ρ × vb² | 0.36 | kN/m² | EN 1991-1-4 §4.5 |
| qp peak velocity pressure = ce × qb | 0.38 | kN/m² | EN 1991-1-4 §4.5 |
✓ External Pressure (we) PASS
util 0.000.30EN 1991-1-4 §7.2
| d/h depth-to-height ratio = L / H | 1.67 | — | |
| Cpe,D windward wall | 0.8 | — | EN 1991-1-4 Table 7.1 |
| Cpe,E leeward wall | -0.7 | — | EN 1991-1-4 Table 7.1 |
| we windward (zone D) = qp × Cpe,D | 0.3 | kN/m² | EN 1991-1-4 §5.2 |
| we leeward (zone E) = qp × Cpe,E | -0.27 | kN/m² | EN 1991-1-4 §5.2 |
✓ Internal Pressure (wi) PASS
util 0.00-0.11EN 1991-1-4 §7.2.9
| Building type | -1 | enclosed | |
| Cpi internal pressure coefficient | -0.3 | — | EN 1991-1-4 §7.2.9 |
| wi internal pressure = qp × Cpi | -0.11 | kN/m² | EN 1991-1-4 §5.2 |
WARNINGS
Simplified ce(z) using log-law approximation — verify against EN 1991-1-4 Figure 4.2 for critical projects.
Cpe values for vertical walls only — roof pressures not calculated.
Try it yourself
Run this calc with your own inputs