Wind Load Inputs
Use the full engineering inputs below. The form uses three columns on large screens, two on medium screens, and one on mobile.
Example Data Table
| Structure | Wind Speed | Kz | Kzt | Kd | I | G | Cp | GCpi | Area | Net Pressure | Total Force |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Wall Panel A | 45 m/s | 0.85 | 1.00 | 0.85 | 1.00 | 0.85 | 0.80 | 0.18 | 18 m² | 448.06 Pa | 8,065.13 N |
| Sign Board B | 38 m/s | 1.03 | 1.10 | 0.85 | 1.15 | 0.85 | 1.20 | 0.18 | 12 m² | 822.81 Pa | 9,873.71 N |
Formula Used
1. Dynamic pressure: q = 0.5 × ρ × V²
2. Velocity pressure at the surface: qz = q × Kz × Kzt × Kd × I
3. Net design pressure: p = qz × (G × Cp − GCpi)
4. Total wind force: F = p × A
5. Overturning moment: M = F × h
6. Factored force and moment: Fdesign = F × SF and Mdesign = M × SF
| Symbol | Meaning |
|---|---|
| ρ | Air density in kilograms per cubic meter. |
| V | Wind speed converted to meters per second. |
| Kz | Exposure coefficient that reflects terrain and height effects. |
| Kzt | Topographic amplification factor. |
| Kd | Wind directionality factor. |
| I | Importance factor for the selected design condition. |
| G | Gust effect factor. |
| Cp | External pressure coefficient. |
| GCpi | Internal pressure coefficient term. |
| A | Projected area exposed to wind. |
| h | Lever arm height to the resultant force. |
| SF | Chosen safety factor. |
How to Use This Calculator
- Enter a structure name so your result exports stay clear.
- Provide wind speed and choose the correct speed unit.
- Enter air density and all engineering coefficients from your standard.
- Fill the projected area and the lever arm height.
- Add a safety factor for design-level review outputs.
- Press Calculate Wind Load to display results above the form.
- Use the CSV or PDF buttons to export the calculated result set.
Frequently Asked Questions
1. What does this wind load calculator estimate?
It estimates dynamic pressure, adjusted surface pressure, total wind force, base shear, overturning moment, and factored design values from user-entered engineering inputs.
2. Which wind speed units are supported?
The form accepts meters per second, kilometers per hour, and miles per hour. The calculator converts all speeds internally to meters per second.
3. Why do I need exposure and topographic factors?
Those factors adjust the basic wind action for terrain roughness, elevation effects, and local topography. They help the pressure estimate better reflect site conditions.
4. What is the difference between total force and design force?
Total force is the direct calculated wind action. Design force multiplies that value by your selected safety factor for a more conservative review.
5. Can this calculator replace code-based structural design?
No. It is a practical engineering calculator for screening and comparison. Final design should follow the governing code, geometry rules, and professional judgment.
6. What does a negative net pressure mean?
A negative result means suction or uplift behavior dominates under the chosen coefficients. Review the sign carefully before applying the result to members.
7. Why is projected area important?
Projected area defines the effective surface catching the wind. Larger exposed area increases the resulting force and the associated overturning moment.
8. Can I export the results for reports?
Yes. After calculation, you can download the results as CSV for spreadsheets or PDF for reports, review notes, and sharing.