DynaPile

DynaPile was developed to compute the dynamic stiffness of single piles or pile groups. The piles can be either floating piles or end-bearing piles. Vertical, horizontal and rocking dynamic stiffnesses will be generated by the program. The program will also generate the group reduction factors for pile groups under small excitation conditions. The method of computation is based on the consistent boundary-matrix method proposed by Blaney, Kausel and Roesset (1976).

Pile foundations were analyzed for some time neglecting interaction effects betwwen the piles through the soil and enforcing only compatibility of displacements at their heads under the assumption of a rigid mat. The dynamic model, which takes into account the whole soil medium in the analysis, can conveniently provide information about group-reduction factors of pile foundations if the soil properties are adjusted to account for the effective level of strains.

Input parameters consist of the structural and dynamic properties of the pile, geometric configuration of the pile groups, soil properties, definition of excitation forces (in frequencies), and definition of superstructures masses.


Features


  • The program includes the effect from the approximate amount of soil mass around a pile that participates in the dynamic response (inertial forces) and in the dissipation of energy (damping).
  • The program can handle single piles as well as pile groups.
  • The user can input up to 20 different soil layers.
  • Unified soil parameters such as shear wave velocity, Poisson's ratio, mass density, and damping ratio, are employed for soil strata.
  • The program performs dynamic analysis in frequency domain. The user can specify up to 100 different frequencies of exciting forces for analyses.
  • Superstructure properties can be included in the analysis. The superstructure properties include options for the mass of the base mat, the mass of the superstructure, and the horizontal spring stiffness.
  • The program will generate group reduction factors of vertical response, horizontal response, and rocking response for pile groups under small excitation conditions.
  • The program accepts either floating or end-bearing piles.
  • The method of computation is based on the consistent boundary-matrix method proposed by Blaney, Kausel and Roesset (1976).