Tower Crane Foundation Design Calculation Example Link -

, there will be a partial loss of contact (liftoff) on one side of the footing. We must calculate the peak ground pressure using the modified pressure equation for high eccentricity. Step 5: Calculate Maximum Ground Pressure , the maximum pressure ( qmaxq sub m a x end-sub

qmax=2×Vtotal3×L×(B2−e)q sub m a x end-sub equals the fraction with numerator 2 cross cap V sub t o t a l end-sub and denominator 3 cross cap L cross open paren the fraction with numerator cap B and denominator 2 end-fraction minus e close paren end-fraction

): The self-weight of the tower crane, counterweights, and the foundation itself. The maximum weight of the materials being hoisted. Wind Loads (

) of the concrete pad. Tower crane foundations are typically square ( tower crane foundation design calculation example link

$$ F_S,SL = \frac\textFriction Resistance\textHorizontal Force = \fracP_total \times \muH $$

$$ P_total = P_crane + G = 774.4 + 1296 = 2070.4\ \textkN $$

, there is a lifting/separation effect on one side of the pad. This requires a more complex structural review of the effective bearing area, or an increase in pad size ( ) or depth ( ) to add more dead weight. , there will be a partial loss of

$$e = \fracM_totalN_total$$

Using the above values, the foundation design calculation can be performed:

q=PtotalA±Mtotal×cIq equals the fraction with numerator cap P sub t o t a l end-sub and denominator cap A end-fraction plus or minus the fraction with numerator cap M sub t o t a l end-sub cross c and denominator cap I end-fraction A = B × L = 6 × 6 = 36 m² The maximum weight of the materials being hoisted

The foundation is a square pad (L x B). For a combined load, maximum pressure at edge:

Mbase=M+(H×D)cap M sub b a s e end-sub equals cap M plus open paren cap H cross cap D close paren

Various resources and tools are available for these scenarios. A search online can reveal Excel spreadsheets specifically designed to automate pile foundation calculations. For example, one spreadsheet details "整体承台式塔吊基础计算" (Overall Pile Cap Foundation Calculation) and includes parameters for a common QTZ5515 tower crane.