RF-/DYNAM Pro - Nonlinear Time History Add-on Module for RFEM/RSTAB

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Extension of RF-/DYNAM Pro for Time History Analysis Considering Nonlinearities

The RF‑/DYNAM Pro - Nonlinear Time History add‑on module allows for nonlinear dynamic analysis to external excitation. Various excitation functions can be defined in a tabular form, as harmonic loads or as a function of time. The nonlinear time history analysis is performed with the nonlinear implicit Newmark analysis (RFEM only) or the explicit analysis. This module extension abolishes the limitation to linear systems in dynamics.

For RFEM, the add‑on module is currently still available as a beta version.

  1. Features

    • User-defined time diagrams as a function of time, in a tabular form, or as harmonic loads
    • Combination of the time diagrams with RFEM/RSTAB load cases or combinations (enables definition of nodal, member and surface loads as well as free and generated loads varying over time)
    • Combination of several independent excitation functions
    • Nonlinear time history analysis with the implicit Newmark analysis (RFEM only) or the explicit analysis
    • Structural damping using Raleigh damping coefficients or Lehr's damping
    • Direct import of initial deformations from a load case or combination (RFEM only)
    • Stiffness modifications as initial conditions, for example axial force effect, deactivated members (RSTAB only)
    • Graphical display of results in a time course monitor
    • Export of results in user-defined time steps or as an envelope
  2. Nonlinearities

    • Nonlinear member types, such as tension and compression members or cables
    • Member nonlinearities, such as failure, tearing, yielding under tension or compression
    • Support nonlinearities, such as failure, friction, diagram, and partial activity
    • Release nonlinearities, such as friction, partial activity, diagram, and fixed if positive or negative internal forces
  3. Limits of RFEM Beta Version

    • Time history analysis of acceleration-time excitations on supports currently in development
    • Nonlinear material models in development
    • Contact elements currently not supported
    • Option to import the initial state from a load case or load combination in preparation
  4. General input data

    Input

    RF-/DYNAM Pro - Nonlinear Time History is integrated in the structure of RF‑/DYNAM Pro - Forced Vibrations and extended by two nonlinear analysis methods (one nonlinear analysis in RSTAB).

    Force-time diagrams can be entered as transient, periodic or as a function of time. Dynamic load cases combine the time diagrams with the static load cases, which provides a great flexibility. Furthermore, it is possible to define time steps for the calculation, structural damping, and export options in the dynamic load cases.

  5. Selecting the nonlinear analysis in RF-DYNAM Pro - Nonlinear Time History

    Calculation

    Calculation in RFEM
    The nonlinear time history analysis is performed with the implicit Newmark analysis or the explicit analysis. Both are the direct time integration methods. The implicit analysis requires small time steps to provide precise results. The explicit analysis determines the required time step automatically to provide the stability to the solution. The explicit analysis is suitable for the analysis of short excitations, such as impulse excitation, or an explosion.

    Calculation in RSTAB
    The nonlinear time history analysis is performed with the explicit analysis. This is a direct time integration method and determines the required time step automatically in order to provide the solution stability.

  6. Time course monitor (temporary failure of tension member due to vibration stress)

    Results

    Due to the integration of RF‑/DYNAM Pro in RFEM or RSTAB, you can incorporate numeric and graphic results from RF‑/DYNAM Pro - Forced Vibrations to the global printout report. Also, all RFEM and RSTAB options are available for a graphical visualization. The results of the time history analysis are displayed in a time course monitor.

    All results are plotted versus time. You can export the numeric values to MS Excel. It is possible to export the result combinations by exporting the results of the individual time steps or filtering the most unfavourable results of all time steps.

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Price
1,120.00 USD

Price is only valid for the software usage in United States.

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