Tower Crane Foundation Design: Calculation Example [2021]

FoS=3,8752,620=1.48FoS equals the fraction with numerator 3 comma 875 and denominator 2 comma 620 end-fraction equals 1.48

= M_R / M_O = 4,468.75 / 4,500 ≈ 0.993

L = B = 5.8 m, h = 1.8 m W_f = 5.8 × 5.8 × 1.8 × 25 = 1,513.8 kN M_R = (850 + 1,513.8) × 2.9 = 2,363.8 × 2.9 = 6,855 kNm F.S. = 6,855 / 4,500 = 1.52 ✅ Passes overturning check. Tower Crane Foundation Design Calculation Example

Tension in most loaded bolt = (M_u × r) / Σ(r²) Where r = distance from centroid to bolt farthest = ~1.414 m (for corner bolt in 2×2 m pattern) Σr² = 24 × (1.414²) = 48 × 2.0 = 96 T_u = (6,750 × 1.414) / 96 = 9,544.5 / 96 =

The objective is to design a safe and cost-effective foundation for a tower crane. Design should prioritize stability against overturning, bearing capacity, and structural integrity under both in-service and out-of-service conditions. 2. Design Parameters & Data Collection Crane Manufacturer Data FoS=3,8752,620=1

= (V + W_f) × (B/2) Where B/2 is the moment arm from the center to the edge (the pivot point).

Checking if the crane mast will "punch" through the concrete. Summary Checklist Checking if the crane mast will "punch" through the concrete

Before any calculation, we need reliable data from two sources: the crane manufacturer and a geotechnical engineer.

The factor of safety (FoS) against overturning is the ratio of the to the overturning moment . Overturning Moment ( Mocap M sub o ): Restoring Moment ( Mrcap M sub r ): Factor of Safety:

Thus, final trial dimensions: .