1. What is Ground Bearing Pressure?

Ground Bearing Pressure (GBP) is the pressure exerted by a Tadano crane on the concrete surface. It's calculated as the total weight divided by the contact area and is measured in kPa (kilopascals).

2. How Does the Calculator Work?

The calculator uses the GBP formula:

Where:

• \( total\_weight \) — Total weight of the crane (kg)
• \( contact\_area \) — Contact area with concrete surface (m²)

Explanation: The formula calculates the pressure distribution of the crane's weight over the contact area with the concrete surface.

3. Importance of GBP Calculation

Details: Accurate GBP calculation is crucial for ensuring the concrete surface can safely support the crane's weight without failure or excessive settlement.

4. Using the Calculator

Tips: Enter total weight in kilograms and contact area in square meters. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a safe GBP value for concrete?
A: Safe GBP values depend on concrete strength and reinforcement. Typically, values between 100-500 kPa are acceptable for standard concrete surfaces.

Q2: How do I measure contact area accurately?
A: Measure the actual area where the crane's outriggers or tracks contact the concrete surface. For irregular shapes, calculate the effective area.

Q3: Does GBP calculation consider dynamic loads?
A: This calculator provides static GBP. For dynamic loads during crane operation, additional safety factors should be applied.

Q4: What if the crane has uneven weight distribution?
A: For uneven distribution, calculate GBP for each support point separately and use the maximum value for safety assessment.

Q5: Can this calculator be used for other surfaces?
A: While designed for concrete, the formula applies to any surface. However, safe pressure limits vary significantly between different surface materials.