Analysis & loading · Wind, snow & cyclone
Wind pressure on cladding & fixings calculator
Design pressure for a cladding element from Vdes, external and internal coefficients, area reduction and local pressure factor; fixing load.
Standard: AS/NZS 1170.2 Cl 2.4, 5.4 (p = 0.5ρV²Cfig Cdyn)
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Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Design wind speed Vdes,θ | 45 | m/s |
| External pressure coefficient Cp,e | -0.9 | |
| Area reduction Ka | 1 | |
| Combination factor Kc | 1 | |
| Local pressure factor Kl | 2.0 (RA2) | |
| Internal coefficient Cp,i | 0.2 | |
| Fixing tributary area | 0.6 | m² |
| Fixing capacity | 1.5 | kN |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| 0.5 ρ V² (ρ = 1.2) | 1.22 | kPa |
| Cfig,e = Cp,e Ka Kc Kl | -1.80 | |
| Net pressure q(Cfig,e − Cp,i Kc) | -2.43 | kPa |
| Fixing load |p| A | 1.46 | kN |
- ✓ Fixing capacity
Method, formulas and assumptions
- 0.5 ρ V² (ρ = 1.2) = 0.5*1.2*45^2/1000 = 1.215 kPa
- Cfig,e = Cp,e Ka Kc Kl = -0.9*1*1*2 = -1.8
- Net pressure q(Cfig,e − Cp,i Kc) = 1.215*(-1.8-0.2*1) = -2.43 kPa
- Fixing load |p| A = ABS(-2.43)*0.6 = 1.458 kN
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.