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For any of directions in which a support acts, it is possible to define a specific flexibility (or stiffness) of the support. To do so, a standard support must be defined and the required constraint set to "flexible". This may be done in the property table of the support.
Let’s assume a cantilever beam subject to a concentrated force load acting at the free end.
The support is defined as flexible in rotation. The flexibility of the support is set to (seen from the top) (i) 1 MNm/rad, (ii) 5 MNm/rad, (iii) complete rigid fixing.
The following picture shows the effect of the stiffness on the vertical displacement of the cantilever beam.
This type of analysis does not required non-linear calculation. The static linear calculation is sufficient to give correct results.