Free Resource · EN 1991-1-4 · SI Units

Wind Load
Cheatsheet

4 pages: terrain categories 0–IV with z₀ and z_min, v_b formula, c_r(z) roughness, q_p(z) peak pressure, c_pe tables for walls and roofs, NL/DE/BE National Annex side-by-side, and a Rotterdam portal frame worked example.

EN 1991-1-4:2005+A1:2010 Table 4.1 terrain categories Table 7.1 walls · Table 7.2 flat roof Table 7.4a duopitch roof NL · DE · BE National Annex Rotterdam worked example

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What's inside — 4 pages
Page 1 — Terrain categories 0–IV table (z₀, z_min), v_b = c_dir × c_season × v_b,0, k_r roughness coefficient, q_p(z) pre-computed table at heights 5–30 m
Page 2 — c_pe external pressure coefficients: walls Table 7.1 (zones A–E, h/d interpolation), flat roof Table 7.2, duopitch Table 7.4a (α = 5°–75°), internal pressure c_pi rules
Page 3 — NL / DE / BE National Annex side-by-side: wind zone maps, v_b,0 by zone, orography notes
Page 4 — Rotterdam 24×60 m warehouse, terrain II, v_b,0=27 m/s: 7-step worked example → q_p=1.00 kN/m², zone pressures, base shear per frame

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What's in the 4 pages
Page 1

Terrain Categories & Basic Wind Velocity

  • Terrain categories 0–IV with z₀ and z_min (Table 4.1)
  • v_b = c_dir × c_season × v_b,0 formula
  • k_r roughness coefficient per terrain category
  • c_r(z) logarithmic profile, z_min plateau rule
  • Pre-computed q_p(z) at 5/8/10/15/20/30 m (terrain II, 27 m/s)
Page 2

Pressure Coefficients c_pe & c_pi

  • Walls Table 7.1: zones A/B/C/D/E with h/d interpolation
  • Flat roof Table 7.2: F/G/H/I zones (sharp eaves)
  • Duopitch Table 7.4a: α = 5° to 75° (F/G/H/I/J)
  • Internal pressure c_pi = ±0.2 / −0.3 rules
  • Net pressure w_net = (c_pe − c_pi) × q_p
Page 3

National Annex — NL · DE · BE

  • NL: NEN-EN 1991-1-4/NB — 3 zones (24/27/30 m/s)
  • DE: DIN EN 1991-1-4/NA — 4 zones (22.5/25/27.5/30 m/s)
  • BE: NBN EN 1991-1-4 ANB — single value 26 m/s
  • Side-by-side NA table: v_b,0, c_dir, k_I, orography
  • City-to-zone reference: Rotterdam, Amsterdam, Hamburg, Munich, Berlin
Page 4

Worked Example — Rotterdam Warehouse

  • 24×60 m plan, 8 m eave, 12° pitch, terrain II, v_b,0 = 27 m/s
  • 7-step calculation: v_b → c_r → v_m → I_v → q_p → zones → base shear
  • q_p(8m) = 1.00 kN/m²
  • Windward wall: +1.01 kN/m² · Roof zone F: −1.38 kN/m² (governs)
  • Base shear per frame (6 m spacing): ~52 kN

Stop looking up terrain tables.
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Terrain categories, v_b formula, q_p(z), c_pe tables — the core EN 1991-1-4 checks on one sheet. FrameAI runs the full wind load calculation automatically for any building geometry, then feeds the result into the EN 1990 load combinations for ULS and SLS design.

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pages — SI units
3
national annexes
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EN 1991-1-4