It is necessary to design the foundation for silage on stilts. Grillage plate, itself, supposed to be made of 40 cm thin shell. Step of piles is 1.6x1.6 m. I want to model piles using FE-51 (Rz) and attach PRB (perfectly rigid body) to the principal nodes (across the pile cross-section). Is it right to set Rz in accordance to calculation results of piles linear stiffness during calculation of friction pile using module “Bases and foundations” in Engineering Assistance Package ESPRI? When analyzing the results of calculation, is it possible to correlate the displacement along the Z-axis with foundation settlement?