Annex A: Pad Foundation Stiffness
This annex specifies the calculation of the stiffness coefficients of a pad foundation.
| Stiffness | Formula |
| Stiffness X |
|
| Stiffness Y |
|
| Stiffness Z |
|
| Stiffness Rx |
|
| Stiffness Ry |
|
| Stiffness Rz |
|
With:
| Value | Info |
| A |
Dimension read from Pad Foundation Library |
| B | Dimension read from Pad Foundation Library |
| C1x | Soil stiffness read from Subsoil Library |
| C1y | Soil stiffness read from Subsoil Library |
| C1z | Soil stiffness read from Subsoil Library |
| C2x | Soil stiffness read from Subsoil Library |
| Ix |
|
| Iy |
|
The rotational stiffness formulas for Rx and Ry are derived from [Ref.7].
Below the soil interaction model on which it is based with the soil stiffness k (corner points) and kw (soil under the edges) at the pad foundation boundaries, also C1 and C2 for the stiffnesses underneath the pad foundation.
