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RF-/DYNAM Pro - Forced Vibrations Add-on Module for RFEM/RSTAB
Extension of RF-DYNAM Pro - Natural Vibrations for Time History Analysis and Multi-Modal Response Spectrum Analysis
The RF-/DYNAM Pro - Forced Vibrations add‑on module provides a tool for dynamic analysis of a supporting structure with regard to external excitation. Various excitation functions can be defined by using time history analysis, accelerations (accelerograms) or harmonic loads, and link them with load cases.
Using the multi‑modal and multi‑point response spectrum analyses, it is possible to perform seismic analyses. The required spectra can be created in compliance with the standards or user‑defined. The add‑on module contains an extensive library of accelerograms from earthquake zones, which can be used to generate response spectra.
Features of Time History Analysis
- Combination of user-defined time diagrams with load cases or combinations (nodal, member and surface loads as well as free and generated loads can be combined with functions varying over time)
- Combination of several independent excitation functions
- Extensive library of seismic events (accelerograms)
- Direct integration (RFEM only) or modal analysis in time history
- Structural damping using Raleigh damping coefficients or Lehr's damping ratios
- Direct import of initial deformations from a load case or combination
- Graphical display of results in a time history diagram
- Export of results in user-defined time steps or as an envelope
Features of Multi-Modal Response Spectrum Analysis
- Response spectra of numerous standards (EN 1998, DIN 4149, IBC 2012, etc.)
- User-defined response spectra or generated from accelerograms
- Direction-relative response spectra approach
- Manual or automatic selection of the relevant mode shapes of response spectra (5 % rule of EC 8 applicable)
- Result combinations by modal superimposition (SRSS or CQC rule) and by direction superimposition (SRSS or 100 % / 30 % rule)
It is necessary to enter the required response spectra, accelerations, or time diagrams. Dynamic load cases define a place and direction of response spectra effects as well as acceleration time, or force-time diagrams.
Time diagrams can be combined with static load cases which provide great flexibility. For the time history analysis, you can import the initial deformation from any load case or load combination.
The time history analysis is performed by means of the modal analysis or the direct integration (RFEM only). Although the modal analysis represents a fast algorithm, it is necessary to use a certain number of eigenvalues to ensure the required accuracy of results.
The direct integration is a very precise method, independent of the number of eigenvalues used. For the response spectra analysis, equivalent static loads are calculated internally. A linear static analysis is performed subsequently.
The results of the time history analysis are displayed in a time course monitor. Results of different nodes and positions are possible to superimpose within a member. All results are displayed according to time. You can export the numeric values to MS Excel.
In the case of a time history analysis, you can export results of the individual time steps or filter most unfavorable results of all time steps.
The response spectra analysis calculation generates result combinations. Mode and load force combinations due to the components of earthquake action are used internally.
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PRICE for RFEM (VAT excluded)
RF-DYNAM Pro - Forced Vibrations 5.xx
PRICE for RSTAB (VAT excluded)
DYNAM Pro - Forced Vibrations 8.xx