Using Modified Stiffnesses for Dynamic Calculations

Tips & Tricks

To consider the distinctive material behavior of concrete elements in the determination of eigenfrequencies, you can first modify the stiffnesses in RFEM 5 or RSTAB 8, and then select the respective check box in the RF‑/DYNAM module.

In RFEM, you can activate or deactivate the consideration of the modified stiffnesses for the determination of deformations and internal forces in the global calculation parameters.


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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