Wind — Load Calculation Excel Sheet Eurocode Verified

| Feature | Benefit | |---------|---------| | Clear separation of inputs / outputs | Easy to modify and review. | | Drop‑down terrain categories | Prevents manual entry errors. | | Graphical output of ( q_p(z) ) | Visual check of pressure profile. | | Support for multiple wind directions | θ = 0°, 90°, etc. | | Zone‑based ( c_pe ) tables | Automatically selects correct zone (A, B, C, D, E for walls; F, G, H, I for roofs). | | National Annex selection | e.g., Germany (DIN), UK (NA to BS EN), France (NF). | | Dynamic factor ( c_sc_d ) calculation | For buildings with ( h > 15 ) m or ( f_1 < 5 ) Hz. | | Error checks / warnings | Flags unrealistic heights or missing inputs. |

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$$I_v(z) = \frack_Ic_0(z) \ln(z / z_0)$$ (Where $k_I$ is the turbulence factor, default 1.0).

| Parameter | Excel Formula Example | | :--- | :--- | | $I_v(z)$ | =1/(B19*LN(MAX(B10,B27)/B18)) | wind load calculation excel sheet eurocode verified

Worksheet “Input & Site” sample row:

| Parameter | Value | Unit | Eurocode Clause | |-----------|-------|------|------------------| | Fundamental basic wind velocity ( v_b,0 ) | 26.0 | m/s | NA.2.1 | | Terrain category | II | – | 4.3.2 | | Building height ( h ) | 12.0 | m | – | | Building width ( b ) | 15.0 | m | – | | Building depth ( d ) | 20.0 | m | – | | Orography factor ( c_0 ) | 1.0 | – | 4.3.3 | | Air density ( \rho ) | 1.25 | kg/m³ | 4.5(1) | | Feature | Benefit | |---------|---------| | Clear

Output area – Peak velocity pressure ( q_p(z_e) ): 0.94 kN/m²

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Prepared by: Structural Verification Unit
Approved by: Eurocode Compliance Reviewer
Attachments: Excel spreadsheet file (WC_Eurocode_Wind_v1.0.xlsx) with locked verification cells. $$I_v(z) = \frack_Ic_0(z) \ln(z / z_0)$$ (Where $k_I$

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To design, implement, and verify a Microsoft Excel spreadsheet capable of calculating design wind pressures and equivalent static wind forces on common building structures in accordance with Eurocode 1 Part 1-4 (EN 1991-1-4). The tool is intended for structural engineers for preliminary design and verification of low-to-medium rise buildings.

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Let’s walk through a concrete example—a 25m tall rectangular office building in suburban Frankfurt (Terrain Category III), using the German National Annex.

This is the critical value used for calculating forces. $$q_p(z) = [1 + 7I_v(z)] \times \frac12 \rho v_m(z)^2$$ (Air density $\rho$ is typically $1.25 kg/m^3$).

| Parameter | Excel Formula Example | | :--- | :--- | | $q_p(z)$ | =(1 + 7*B32) * 0.5 * 1.25 * B29^2 | | Result ($N/m^2$) | Example Result: ~950 Pa |

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