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FAQ 003437 EN

7 August 2019

Stefan Frenzel Add-on Modules RFEM RSTAB

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


The directivity 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 mode shapes 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 basic and topical drawings. For a three-dimensional analysis, masses in all global directions are considered.


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