Tower Crane Foundation Design Calculation Example Link
Notes and next steps (brief)
FOSover=Resisting MomentOverturning Moment=Ptotal×(B/2)Mtotalcap F cap O cap S sub o v e r end-sub equals the fraction with numerator Resisting Moment and denominator Overturning Moment end-fraction equals the fraction with numerator cap P sub t o t a l end-sub cross open paren cap B / 2 close paren and denominator cap M sub t o t a l end-sub end-fraction
Used when soil bearing capacity is low, often combined with permanent building piles.
e=MbasePtotal=4,368 kNm2,328.75 kN=1.875 me equals the fraction with numerator cap M sub b a s e end-sub and denominator cap P sub t o t a l end-sub end-fraction equals the fraction with numerator 4 comma 368 kNm and denominator 2 comma 328.75 kN end-fraction equals 1.875 m tower crane foundation design calculation example link
Volume=5.5×5.5×1.3=39.325 m3Volume equals 5.5 cross 5.5 cross 1.3 equals 39.325 m cubed
The foundation must resist three primary load types acting simultaneously: Vertical Load (
A tower crane foundation must safely transfer massive vertical, horizontal, and overturning loads to the ground. Engineering this structure requires meticulous compliance with structural codes like ACI 318 or Eurocode 2. Calculate the bending moment at the face of
Calculate the bending moment at the face of the crane mast steel legs. Provide bottom steel mesh reinforcement to handle tension zones. Top reinforcement is also required to resist moments from self-weight when the crane experiences uplift on one side.
To prevent a catastrophic failure, Elias applied a of at least 1.5. He needed to find a footing size where the Resisting Moment ( Mstcap M sub s t end-sub ) significantly outweighed the Overturning Moment ( MOTcap M sub cap O cap T end-sub ). Sizing the Pad: He initially modeled a square footing. Checking Soil Bearing: With a soil capacity of , he verified that the pressure transferred to the ground ( in this scenario) stayed well within safe limits. Everything You Need to Know About Tower Cranes
from the face of the loaded area, depending on the design code). If the stress exceeds concrete capacity, increase the depth ( ) or add shear reinforcement. 4. Tower Crane Foundation Design Calculation Example Link To prevent a catastrophic failure, Elias applied a
The resisting moment (due to the weight of the crane and foundation) must be greater than the overturning moment multiplied by a factor of safety (usually
Maximum Overturning Moment ( Mmaxcap M sub m a x end-sub ) = 2,500 kNm Maximum Vertical Load ( Vmaxcap V sub m a x end-sub ) = 600 kN Horizontal Shear (H) = 150 kN Foundation Dimensions (Initial Assumption): Width (B) = 6.0 m Length (L) = 6.0 m Depth (D) = 1.5 m Material Properties: Concrete Density ( γcgamma sub c ) = 25 kN/m³ Concrete Strength ( fc′f sub c prime ) = 30 MPa Steel Yield Strength ( ) = 420 MPa Soil Parameters: Allowable Soil Bearing Pressure ( qallq sub a l l end-sub ) = 200 kN/m² B. Load Calculation Weight of Foundation ( Wfcap W sub f ):
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
Driving force ( H_d = 1.5 \times 75 = 112.5 , kN ) ( FOS_slide = 1030 / 112.5 = 9.2 \gg 1.5 ) → OK.
The foundation is designed as a cantilever beam, with maximum moment at the edge of the tower mast. (Simplification for example). Calculate Reinforcement Requirement ( Ascap A sub s ): Using the formula
