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What is the purpose of the "Calculate eigenvector for unstable model..." option in RF‑STABILITY?


This feature is intended to detect the modeling errors in a structure that may lead to instability. Using this method, it is possible to calculate such systems and to graphically determine the instability cause.

This feature is not suitable for the following problems:
  • Calculation aborts due to overloading (stability problems)
  • Determination of buckling curves and buckling modes
If the system is stable and the stability problems only occur during the calculation according to the second-order analysis, this function sets all results to 0.

The problem solving of instabilities is described in detail in FAQ 3045 .


Instability Eigenvector Buckling mode Buckling


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RFEM Other

Add-on Module

Stability analysis according to the eigenvalue method

Price of First License
1,030.00 USD