In the "Peak Pressure" tab:
EN 1991-1-4 provides guidance on determining natural wind actions for the structural design of buildings and civil engineering works. The calculation process moves from a broad regional climate baseline down to specific localized pressures on individual building surfaces. 1. Fundamental Wind Velocity (
), which is adjusted for terrain roughness, orography (topography), and height above ground. External and Internal Pressures: Wind creates both external pressure ( ) on the building's envelope and internal pressure (
While specialized software (like RoboStruct or Staad Pro) handles these calculations automatically, many engineers prefer—and often require—a transparent, hand-calculation approach. This is where an becomes an indispensable tool.
For fatigue or serviceability, the sheet processes wind loads from 8 or 16 directions with respective probability factors.
| Parameter | Cell | Value | |-----------|------|-------| | Building height h (m) | B3 | 12 | | Building width b (m) | B4 | 8 | | Building depth d (m) | B5 | 10 | | Terrain category (0-IV) | B6 | III | | Fundamental v_b0 (m/s) | B7 | 26 (e.g., Germany zone 2) | | Air density ρ (kg/m³) | B8 | 1.25 | | c_dir, c_season | B9,B10 | 1.0 | | Orography factor c_o | B11 | 1.0 | | cs cd factor | B12 | 1.0 (if h<15m) |
| Cell | Formula | |------|---------| | v_b | =B7 * B9 * B10 | | q_b | =0.5 * B8 * (v_b^2) |
