Check out these tips to help you get started with the RFEM program.
Modal Relevance Factor for Stability Analysis
First Steps with RFEM
The modal relevance factor (MRF) can help you to assess to which extent specific elements participate in a specific mode shape. The calculation is based on the relative elastic deformation energy of each individual member.
The MRF can be used to distinguish between local and global mode shapes. If multiple individual members show significant MRF (for example, > 20%), the instability of the entire structure or a substructure is very likely. On the other hand, if the sum of all MRFs for an eigenmode is around 100%, a local stability phenomenon (for example, buckling of a single bar) can be expected.
Furthermore, the MRF can be used to determine critical loads and equivalent buckling lengths of certain members (for example, for stability design).
Do you have any questions about our products or which are best suited for your design projects? Contact us via phone, email, chat, or forum, or search the FAQ page, available 24/7.
This article presents the linear critical load analysis of cross-sections in RFEM 6 and RSTAB 9.
RFEM/RSTAB Add-On Modules RF-IMP/RSIMP | Generation of Equivalent Geometric Imperfections and Pre-Deformed Initial Structures