Negative = suction (outward). Positive = pressure (inward).

Where (k_I) is the turbulence factor (typically 1.0). Your Excel sheet needs this for the next step.

: Offers a Free Lite Version that calculates wind on structures including walls, roofs, and canopies.

Doing this manually for 10 different wind directions or multiple zones? That’s a full afternoon. An turns it into a 5-minute job.

👉 Excel tip: Use VLOOKUP to fetch terrain parameters ( z_0 ) and ( z_min ) from a reference table.

values (Zones A, B, C, D, E) and terrain parameters to minimize manual entry. Conditional Formatting:

| Worksheet | Purpose | |-----------|---------| | | Site data, terrain category, building dimensions, basic wind speed from national map | | Terrain Table | ( z_0, z_min, k_r, c_r(z) ) for categories 0 to IV | | q_p(z) | Automatic calculation of peak velocity pressure at reference height | | c_pe Table | Pressure coefficients for vertical walls (zones A–E) and roofs (F–J) | | Output | Final net pressures per zone + total horizontal/vertical wind force |

Most engineers simplify: ( q_p(z) = c_e(z) \cdot q_b ) where c_e(z) is the exposure factor. Your sheet should compute both ways.

The fundamental value provided in your country's National Annex. Terrain Category: Selection (I to IV) to determine the roughness length ( ) and terrain factor ( Building Dimensions: ), width ( ), and depth ( Directional factor ( c sub d i r end-sub ), season factor ( c sub s e a s o n end-sub ), and orography factor ( ) (usually 1.0 unless on a hill). EurocodeApplied.com 2. Core Calculation Steps Set up your spreadsheet to follow this logical flow: Basic Wind Velocity (

q sub p open paren z close paren equals open bracket 1 plus 7 center dot cap I sub v open paren z close paren close bracket center dot one-half center dot rho center dot v sub m open paren z close paren squared is wind intensity and is air density, typically Wind Pressure on Surfaces (