FAQ 000468 EN
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Parametrized Model for Four Different Time History Analyses of Remote Explosion | Knowledge Base Article 001660
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.
Different natural frequencies without consideration (left) and with consideration of tension members (right)
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.
- Why do I only obtain the seismic loads calculated in one direction in the case of design with RF‑/DYNAM Pro?
- During the check in RF‑/DYNAM Pro, I get the message "No natural vibration case or dynamic load case has been selected for the calculation." Why?
- 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?
- How is it possible to consider tension members in RF‑/DYNAM Pro?
- Which modules are responsive via the COM interface RS‑COM or RF‑COM?
- 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?
Dynamic analysis of natural frequencies and mode shapes of member models
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models