Constitutive law defining a concentrated stiffness at one node, onde degree of freedom, possible use as a linear spring.
Definition of a stiffness at one DOF, useful in case of contact solid-solid where one solid has only the stiffness issued from the contact elements.
In case of pilot node, it gives a stiffness and a stress to the foundation outside any contact occurrence. Only the element STIFF uses this law.
Prepro: LLSTIFF.F
| Plane stress state | YES |
| Plane strain state | YES |
| Axisymmetric state | YES |
| 3D state | YES |
| Generalized plane state | YES |
| Line 1 (2I5, 60A1) | |
|---|---|
| IL | Law number |
| ITYPE | 97 |
| COMMENT | Any comment (up to 60 characters) that will be reproduced on the output listing |
None.
| Line 1 (3G10.0) | |
|---|---|
| STIFF | Value of the concentrated stiffness term |
| $\alpha$ | 2D angle to define direction of spring when IDDL = -1 (see STIFF element) |
| $\beta$ | Idem for 3D analysis |