Specifies stiffness associated with any support, guide, limit stop, rod, or spring that can be defined as a restraint. If you leave this option blank then the defined restraint is considered rigid. The default rigid restraint stiffness is 1.0E12. Avoid stiffnesses greatly in excess of 1.0E15.
Translation - Typical units (depending on your unit system):
-
lb/in
-
N/mm
-
N/m
-
N/cm
Rotation - Typical units (depending on your unit system):
-
in•lb/deg
-
N•m/deg
K1 is the initial stiffness of a bilinear restraint (for example, X2). If the restraint is not rigid, then you can type any positive stiffness.
If you specify a stiffness value for an anchor, the translational degrees of freedom at the anchored node receive the specified value, and the rotational degrees of freedom receive a factored value using the ratio of rotational stiffness divided by translational stiffness. The ratio is determined by the units you define for the model.
Units File |
Rotational |
Translational |
Ratio |
ENGLISH |
1 |
1 |
1 |
DEUTSCH |
0.11298 |
0.175127 |
0.64513 |
BAR |
0.11298 |
0.175127 |
0.64513 |
FRANCE |
0.11298 |
0.175127 |
0.64513 |
JAPAN |
0.11298 |
175.12 |
6.4516e-4 |
MM |
0.11298 |
175.12 |
6.4516e-4 |
SI |
0.11298 |
1.75127 |
0.064513 |
TUV |
0.11298 |
0.175127 |
0.64513 |