Tower Crane Foundation Design Calculation Example Link

Designing a tower crane foundation requires rigorous structural checks to ensure it can withstand the extreme overturning moments and vertical loads of a freestanding crane. Most foundations are designed as isolated footings (spread footings), though pile caps are used if soil bearing capacity is low. Step-by-Step Calculation Example

• Area A = B² = 2.2² = 4.84 m²
• Applied average pressure p_app = V / A = 120 kN / 4.84 m² = 24.8 kN/m² — well below allowable 150 kN/m²
• Check that eccentricity e = M / V = 600 kN·m / 120 kN = 5.0 m (this is based on factored moment and unfactored vertical load; design must ensure pressure distribution remains compressive)
• For a square footing of width B, allowable eccentricity without tension is B/6 from center (for linear pressure distribution). B/2 = 1.1 m half-width; B/6 ≈ 0.367 m. e = 5.0 m >> B/6, which indicates vertical load is too small relative to moment — additional stabilizing measures required (e.g., increase footing size, add ballast, tie-down anchors, reduce M by crane configuration).

  : Verify that the calculated soil stress is within the allowable bearing capacity defined in the site's soil investigation report. Structural Checks Punching Shear tower crane foundation design calculation example link

  Pin this for later: Want a guide to the best street foods for beginners? Let me know in the comments! Area A = B² = 2

• Soil Properties:

  Prepared by:
  Senior Structural Engineer
  Approved by: Geotechnical & Lifting Specialist increase footing size

  Soil data (assumed):

  Step 4 — Check bearing pressure and vertical load