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GEO5

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Spring Method

The pile group is analyzed using the Finite Element Method. The pile cap is considered as infinitely stiff. A general load is applied in the center of the cap and can be imported from an arbitrary program that performs static analysis.

The piles analyzed according to figure:

Modeling piles

Four options to model piles are available in the frame "Settings":

  1. Floating piles - compute the stiffness of springs from soil parameters
  2. Floating piles - input the stiffness of springs
  3. Piles resting on the rock subgrade
  4. Piles fixed into the rock subgrade

All options require inputting the "Horizontal modulus of subsoil reaction" characterizing the pile behavior in the transverse direction. Floating piles further require determining the stiffness of vertical springs. The program allows for back calculation of this stiffness from the available soil parameters and the typical load. They can be also input directly in the frame "Vertical springs".

Either hinge or fixed-type connection of a pile to the pile cap can be considered.

Connecting pile to the pile-cap (selected in the frame "Settings")

The own analysis of structure is performed using the finite element method (FEM). Each pile is divided into ten elements. For each element the program defines the magnitude of horizontal and vertical springs. In comparison to an single pile, the stiffness of horizontal and vertical springs are further reduced for both the inner and outer piles - the horizontal stiffness is reduced by the coefficients equal to 0,5 and 0,25 for the outer and inner piles, respectively; the shear stiffness is reduced by the coefficients equal to 0,5 and 0,1 for the outer and inner piles, respectively. These reductions well represent the real behavior of a pile group. The springs at the pile-base are not reduced.