The Structure Stability add-on allows for a nonlinear stability analysis according to the eigenvalue method or the incremental method. You can thus determine results close to reality also for nonlinear structures. In the case of the incremental method, the load is increased gradually until the critical load factor is reached.
It is necessary to assign the stability analysis setting to a load case (or a load combination) that is relevant for the analysis.
Usage in RFEM and RSTAB
The programs provide several equation solvers for the eigenvalue analysis. They allow for efficient calculations for various model types.
- Lanczos (RFEM)
- Roots of Characteristic Polynomial (RFEM)
- Subspace Iteration Method (RFEM/RSTAB)
- Shifted Inverse Iteration (RSTAB)
