Natural Vibration Case
It is possible to create several natural vibration cases and thus to compare different settings with each other.
In order to perform further dynamic analyses, such as the response spectrum analysis or the time course analysis, it is absolutely necessary in most cases to previously define a natural vibration case. This is the basis for further calculations.
With RF-/DYNAM Pro Equivalent Loads, it is possible to perform an equivalent load calculation using the multimodal response spectrum method. In the example shown here, this was done for a multi‑mass oscillator.
The stiffness of gas given by the ideal gas law pV = nRT can be considered in the nonlinear dynamic analysis.
The calculation of gas is available for accelerograms and time diagrams for both the explicit analysis and the nonlinear implicit Newmark analysis. To determine the gas behaviour correctly, at least two FE layers for gas solids should be defined.
- Is it possible to display natural frequencies separately for each direction?
- What is the approach for seismic design in RFEM/RSTAB?
- What do the symbols mean in the graphical representation of the mode shapes of the RF-/DYNAM Pro add-on module?
- In RF-/DYNAM Pro, I get the error message: "The assigned mass case does not exist," although I have defined a mass case. What is the reason?
- In RF- / DYNAM Pro, I can select a conversion type for the mass. What do the different options mean and what are the differences?
- In RF‑/DYNAM Pro, the "From self-weight of structure" option is available in a mass case. Is it always necessary to activate this option in order to consider the dead load of the structure?
- How can I consider prestressed cables in RF‑/DYNAM Pro?
- In RF‑/DYNAM Pro, I get the error message No. 10040: "It was impossible to calculate all eigenvalues with required accuracy. [...]." How can I fix this error?
- When calculating mode shapes in RF‑/DYNAM Pro, I obtain effective modal mass factors that are all approximately 0. What is the reason?
- How can I display nodal masses?
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
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Dynamic analysis of natural frequencies and mode shapes of member models