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Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

  • Defining 2 FE Mesh Layers for One Gas Solid

    Considering the Stiffness of Gas Solids in Nonlinear Time History Analysis

    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.

  • Conversion of Lehr's Damping into Rayleigh Damping

    Calculation with consideration of a damping ratio (or Lehr's damping) is not possible in the direct time step integrations. Instead, the Rayleigh damping coefficients must be specified by the user.

    In technical literature, the given damping ratio for specific construction forms is in many cases only a rough approximation of the real damping ratios. In RF-/DYNAM Pro - Forced Vibrations, it is possible to use the value of damping ratio to determine the Rayleigh damping. This may occur at one or two natural angular frequencies defined by the user.

  • Member Type "Dashpot"

    The member type "Dashpot" can be used for time history analyses in RFEM/RSTAB with the add-on modules RF-/DYNAM Pro - Forced Vibrations and RF-/DYNAM Pro - Nonlinear Time History. This linear viscous damping element considers forces dependent on velocity.

    With regard to viscoelasticity, the member type "Dashpot" is similar to the Kelvin-Voigt model which consists of the damping element and an elastic spring (both connected in parallel).

  • Pushover Analysis Software

    In RFEM, it is possible to determine pushover curves (also called capacity curves) and export them to Excel.

    With the RF-DYNAM Pro - Equivalent Loads add-on module, it is possible to generate automatically load distribution in accordance with a mode shape and export it as load case to RFEM.
  • RF-/DYNAM Pro - Nonlinear Time History | 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
  • RF-/DYNAM Pro - Nonlinear Time History | 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
  • RF-/DYNAM Pro - Nonlinear Time History | 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.

  • 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.
  • RF-/DYNAM Pro - Nonlinear Time History | Results

    Due to the integration of RF‑/DYNAM Pro in RFEM or RSTAB, you can incorporate numeric and graphic results from RF‑/DYNAM Pro - Nonlinear Time History 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 history diagram.

    Results are displayed as a function of time and the numerical values can be exported to MS Excel. Result combinations can be exported, either as a result of a single time step or the most unfavorable results of all time steps are filtered out.

  • Features

    • Response spectra in accordance with different standards
    • The following standards are implemented:
      • European Union EN 1998-1:2010 + A1:2013 (European Union)
      • Germany DIN 4149:1981-04 (Germany)
      • Germany DIN 4149:2005-04 (Germany)
      • United States of America IBC 2000 (USA)
      • United States of America IBC 2009-ASCE/SEI 7-05 (USA)
      •  IBC 2012/15 - ASCE/SEI 7-10 (USA)
      • United States of America IBC 2018 - ASCE/SEI 7-16 (USA)
      • Austria ÖNORM B 4015:2007-02 (Austria)
      • Italien NTC 2018 (Italy)
      • Spain NCSE-02 (Spain)
      • Switzerland SIA 261/1:2003 (Switzerland)
      •  SIA 261/1:2014 (Switzerland)
      • Turkey O.G. 23089 + OG 23390 (Turkey)
      •  SANS 10160-4 2010 (South Africa)
      • Saudi Arabia SBC 301:2007 (Saudi Arabia)
      • China GB 50011 - 2001 (China)
      • China GB 50011 - 2010 (China)
      • Canada NBC 2015 (Canada)
      • Algeria DTR BC 2-48 (Algeria)
      • Algeria DTR RPA99 (Algeria)
      • Mexico CFE Sismo 08 (Mexico)
      • Argentina CIRSOC 103 (Argentina)
      • Colombia NSR - 10 (Colombia)
      • India IS 1893:2002 (India)
      • Australia AS1170.4 (Australia)
      • Chile NCh 433 1996 (Chile)
    • The following National Annexes according to EN 1998-1 are available:
      • Germany DIN EN 1998-1/NA:2011-01 (Germany)
      • Austria ÖNORM EN 1991-1-1:2011-09 (Austria)
      • Belgium NBN - ENV 1998-1-1: 2002 NAD-E/N/F (Belgium)
      • Czech Republic ČSN EN 1998-1/NA:2007 (Czech Republic)
      • France NF EN 1998-1-1/NA:2014-09 (France)
      • Italien UNI-EN 1991-1-1/NA:2007 (Italy)
      • Portugal NP EN 1998-1/NA:2009 (Portugal)
      • Romania SR EN 1998-1/NA:2004 (Romania)
      • Slovakia STN EN 1998-1/NA:2008 (Slovakia)
      • Slovenia SIST EN 1998-1:2005/A101:2006 (Slovenia)
      • Cyprus CYS EN 1998-1/NA:2004 (Cyprus)
      •  NA to BS EN 1998-1:2004:2008 (United Kingdom)
      •  NS-EN 1998-1:2004 + A1:2013/NA:2014 (Norway)
    • Entering user-defined response spectra
    • Use of directional response spectra
    • Relevant mode shapes for the response spectrum can be selected manually or automatically (5% rule from EC 8 can be applied)
    • Generated equivalent static loads are exported to load cases, separately for each modal contribution and separated for each direction
    • Result combinations by modal superposition (SRSS and CQC rule) and direction superposition (SRSS or 100% / 30% rule)
    • Signed results based on the dominant eigenmode can be displayed

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