We ignore passive earth pressure here for simplicity, but it adds extra safety.
For 7 m square, 2.5 m projection, (M_Ed \approx 0.5 \times q_max \times B \times c^2 = 0.5 \times 204.5 \times 7 \times 6.25 = 4473 , \textkNm) – that’s total moment. Tower Crane Foundation Design Calculation Example
M_R = (850 + 937.5) × (5.0 / 2) M_R = 1,787.5 × 2.5 = We ignore passive earth pressure here for simplicity,
To make this concept practical, let us work through a simplified but realistic scenario. We will design a square raft foundation for a standard tower crane. 2.5 m projection