1. What is GBP?

GBP (Ground Bearing Pressure) is a measure of the pressure exerted by a crane on the ground surface. It is calculated by dividing the total weight of the crane by the contact area between the crane and the ground.

2. How Does the Calculator Work?

The calculator uses the GBP equation:

Where:

• \( total\_weight \) — Total weight of the crane (kg)
• \( contact\_area \) — Contact area between crane and ground (m²)

Explanation: The equation calculates the pressure distribution to ensure the ground can safely support the crane's weight.

3. Importance of GBP Calculation

Details: Accurate GBP calculation is crucial for crane safety operations, preventing ground subsidence, and ensuring stability during lifting operations.

4. Using the Calculator

Tips: Enter total weight in kilograms and contact area in square meters. All values must be valid (weight > 0, area > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is GBP important for crane operations?
A: GBP determines if the ground can safely support the crane's weight without sinking or becoming unstable during lifting operations.

Q2: What are typical GBP values for different ground types?
A: GBP requirements vary by ground type - firm ground typically supports 50-100 kPa, while soft ground may require mats or cribbing to reduce pressure.

Q3: How is contact area measured?
A: Contact area is calculated based on the crane's outrigger pads or crawler tracks and their contact surface with the ground.

Q4: Does GBP change during crane operation?
A: Yes, GBP changes as the crane boom moves and load shifts, requiring consideration of dynamic loading conditions.

Q5: What safety factors should be considered?
A: Always include safety margins and consider ground conditions, weather, and potential dynamic loads during lifting operations.