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.
Translation - Typical units (depending on your unit system):
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lb/in
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N/mm
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N/m
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N/cm
Rotation - Typical units (depending on your unit system):
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in•lb/deg
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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.
Avoid stiffnesses greatly in excess of 1.0E15. If a stiffness value is specified for an anchor, the stiffness applies for all six degrees of freedom at the anchored node.