Tower crane foundation design requires a detailed analysis of overturning, bearing pressure, and structural reinforcement based on manufacturer loads and geotechnical reports. Key steps include verifying a safety factor against overturning of ≥1.5is greater than or equal to 1.5
Calculate the required footing size to maintain a factor of safety (FoS) against overturning, typically 1.5. Overturning Moment ( cap M sub cap O cap T end-sub Restoring Moment ( cap M sub r e s end-sub . For a medium crane, a common footprint is approximately 3. Soil Bearing Capacity Check
Foundation geometry (trial size):
The foundation acts as a counterweight. Its primary job is to ensure that the combined center of gravity of the crane, the load, and the foundation remains safely within the foundation's "kern" (the middle third of the base) to prevent overturning and minimize ground bearing pressure.