Use a load factor γ = 1.4 for structural design to BS 8110.
$$ A_s = \fracM_u \times 10^60.87 \times f_y \times 0.95 \times d \approx \frac348.7 \times 10^60.87 \times 460 \times 0.95 \times 1350 \approx 722\ \textmm²/m $$
): Crucial for tower crane design. Wind acts against the mast, the jib, and the load, creating massive lateral forces and overturning moments, both when the crane is operating and when it is out of service. Overturning Moments (
) provided by the geotechnical report. The maximum pressure occurs at the edge of the footing due to the overturning moment. tower crane foundation design calculation example link
σmax=58.94+86.40=145.34 kPasigma sub m a x end-sub equals 58.94 plus 86.40 equals 145.34 kPa
Includes the dead weight of the crane and the maximum lifted load. Overturning Moment (
Tower Crane Foundation Design: Guide and Calculation Example Use a load factor γ = 1
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
concrete slab. If it's too light to resist wind moments, increase dimensions (e.g., to ) and recalculate until stability is achieved. Essential Reference Links
Calculated qmax=241.3 kPaCalculated q sub m a x end-sub equals 241.3 kPa Overturning Moments ( ) provided by the geotechnical
). A common starting trial size for a medium-capacity crane is 5.0m x 5.0m x 1.2m. Step 2: Soil Bearing Capacity Check
Step 2: Soil Bearing Capacity Check (Serviceability Limit State) The total vertical load acting on the soil is
A tower crane foundation is designed to transfer the loads from the crane to the ground, while ensuring the stability of the crane and preventing any potential failures. A poorly designed foundation can lead to accidents, damage to the crane, and even collapse of the structure. Therefore, it is essential to design a tower crane foundation that can withstand various loads, including:
): Total weight of the crane structure, counterweights, and the maximum rated hook load. Horizontal Load ( H1cap H sub 1
You must obtain technical data from the crane manufacturer for both in-service (operating) and out-of-service (storm/wind) conditions. Vertical Load (V): Crane weight + max lifted load + ballast. Horizontal Load (H): Lateral wind forces. Overturning Moment (M):