qmin=54.17−75.69=-21.52 kN/m2q sub m i n end-sub equals 54.17 minus 75.69 equals negative 21.52 kN/m squared Since
Designing a tower crane foundation requires balancing extreme vertical loads and significant overturning moments from wind and operation. The most authoritative resource for this process is the , which provides standardized procedures and worked examples compliant with Eurocodes. 1. Key Design Stages
Check: e > B/6 = 5.0/6 = 0.833 m → occurs. Max bearing pressure under trapezoidal distribution:
Manufacturers provide service loads (unfactored characteristic loads). For this example, consider a 36 m high tower crane with a 70 m boom: tower crane foundation design calculation example link
e = Mtotal / Vtotal = = 1.95 m
( V_total = V_k + W_f = 950 + 750 = 1,700 , kN )
Offers an interactive, cloud-based platform for foundation analysis. You can explore their free utilities and structural calculation guides directly on the SkyCiv Official Website. qmin=54
This exceeds allowable (150 kN/m²) → .
Sizing the foundation (concrete pad, piles, etc.) and designing reinforcement. Key Design Loads
Large overturning moments shift the resultant vertical force away from the center of the footing. We must calculate this eccentricity ( ) to determine the shape of the soil pressure distribution. Key Design Stages Check: e > B/6 = 5
- The industry-standard UK guidance for foundation and tie design. Structural World Design Criteria
: A conceptual guide on iterative sizing and overturning checks is available for basic pad foundations.
Below is a practical verification example for a standard hammerhead tower crane fixed on a concrete pad. Input Parameters 800 kN Overturning Moment ( ): 2,400 kNm Horizontal Shear Force ( ): 120 kN Allowable Soil Bearing Capacity ( qallq sub a l l end-sub ): 200 kPa Concrete Density: 25 kN/m³ Trial Pad Dimensions Width ( ): 5.5 m Length ( ): 5.5 m Depth ( ): 1.3 m Calculation Steps 1. Pad Weight Calculation
Result: . The foundation is stable against overturning. 4. Digital Tools and Calculation Templates