EC1 Wind Loading — BuildMetrics

💨 EC1 Wind Loading (UK NA)

🗺 Site & Wind Speed ▾

v_b,0 — Fundamental basic wind velocity m/s — from UK wind speed map / BS EN 1991-1-4 UK NA Figure NA.1

Site altitude above sea level m

c_dir — Directional factor UK NA Table NA.1 (conservative = 1.0)

c_season — Seasonal factor UK NA Table NA.2 (annual = 1.0)

🌿 Terrain & Exposure ▾

Terrain category

Distance from sea km

📐 Building Geometry ▾

h — Building height m

b — Crosswind width (⊥ to wind) m

d — Along-wind depth (∥ to wind) m

⚙ Advanced ▾

ρ — Air density kg/m³ (standard = 1.226)

c_o — Orography factor 1.0 for flat site (§4.3.3)

c_sc_d — Structural factor 1.0 for buildings < 100 m (§6)

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Enter site conditions and building geometry, then click Calculate to determine wind pressures and forces per EN 1991-1-4 with UK National Annex.