FAQ 003437 EN-US


Stefan Frenzel Add-on Modules RFEM RSTAB

What is meant by the effect of masses in RF-/DYNAM Pro — Natural Vibrations?


The direction effect of the masses must be defined. The masses can act in global displacement directions X, Y, or Z by selecting the corresponding check boxes. You can also rotate masses around the global axes X, Y, and Z by selecting the corresponding check boxes. These settings change the mass matrix and lead to different eigenvectors and natural frequencies. To perform a planar analysis of the structure, activate only the masses in one of the global directions. A planar analysis is only allowed for regular buildings in the ground plan and elevation. When dealing with a three-dimensional analysis, masses are considered in all global directions.


Masses Natural frequency

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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
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD