What Is a Pergola Post Size Calculator?

Why Is a Pergola Post Size Calculator Used?

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Pergola Post Size Calculator

How to Use the Pergola Post Size Calculator?

1. Enter the span between posts in feet.
2. Enter the height of the pergola in feet.
3. Enter the intended load on the pergola in pounds (this includes the weight of the structure, plants, and any other hanging elements).
4. Click the "Calculate Post Size" button.
5. The required post size (cross-sectional dimension) will be displayed in inches.

Example Calculation:

Let's say you have a pergola with a span of 10 feet, a height of 8 feet, and an intended load of 1000 pounds.

• Span = 10 feet
• Height = 8 feet
• Load = 1000 pounds

Using a simplified formula to estimate the required post size:

• Safety Factor = 1.5 (for safety margin)
• Moment = (load * span^2) / 8 = (1000 * 10^2) / 8 = 1250 lb-ft
• Inertia = (moment * 12) / (height^3) = (1250 * 12) / (8^3) = 3.75 in^4
• Post Size = √(inertia) * safetyFactor = √(3.75) * 1.5 ≈ 2.30 inches

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