Response Spectrum Analysis | RFEM 6 / RSTAB 9

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Extension of Modal Analysis for Multi-Modal Response Spectrum Analysis


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In the Response Spectrum Analysis add-on, the seismic analysis is performed using the multi-modal response spectrum analysis. The spectra required for this can be created in compliance with the standards or user-defined. From this, the equivalent static forces are generated.

The add-on includes an extensive library of accelerograms from seismic zones. These can be used to generate response spectra.



  • Response spectra of the following standards are implemented:
    • European Union EN 1998-1:2010 + A1:2013 (European Union)
    • Germany DIN 4149:2005-04 (Germany)
    • Switzerland SIA 261:2020-08 (Switzerland)
    • Switzerland SIA 261:2014-07 (Switzerland)
    • United States ASCE 7 | 2016 - IBC | 2018 (USA)
    • United States ASCE 7 | 2010 - IBC | 2012/15 (USA)
    • United States ASCE 7 | 2005 - IBC | 2009 (USA)
    • United States IBC 2000 (USA)
    • Mexico CFE Sismo:2015-07 (Mexico)
    • Argentina CIRSOC 103:2013-07 (Argentina)
    • People's Republic of China GB 50011-2010-12 (China)
    • India IS 1893:2016-12 (India)
    • Canada NBC 2015 (Canada)
    • Spain NCSE 02:2009 (Spain)
    • Netherlands NPR 9998:2018-11 (Netherlands)
    • Italy NTC 2018-01 (Italy)
    • Romania P 100-1:2013-08 (Romania)
    • Turkey TBEC:2018 (Turkey)
  • The following National Annexes according to EN 1998-1 are available:
    • Germany DIN EN 1998-1/NA:2011-01 (Germany)
    • Austria ÖNORM EN 1998-1/NA:2017-07 (Austria)
    • Switzerland SN 1998-1/NA:2019-12 (Switzerland)
    • European Union 1998-1/NA:2013-05 (European Union)
    • Bulgaria BDS 1998-1/NA:2012-03 (Bulgaria)
    • United Kingdom BS EN 1998-1/NA:2008-08 (United Kingdom)
    • Czech Republic CSN EN 1998-1/NA:2016-09 (Czech Republic)
    • Cyprus CYS EN 1998-1/NA:2009-03 (Cyprus)
    • Greece ELOT EN 1998-1/NA:2015-04 (Greece)
    • Lithuania LST EN 1998-1/NA:2010-12 (Lithuania)
    • Luxembourg ILNAS EN 1998-1/NA:2011-09 (Luxembourg)
    • Latvia LVS EN 1998-1/NA:2015-01 (Latvia)
    • Malaysia MS EN 1998-1/NA:2017-01 (Malaysia)
    • Belgium NBN EN 1998-1/NA:2011-10 (Belgium)
    • France NF EN 1998-1/NA:2013-12 (France)
    • Portugal NP EN 1998-1/NA:2010-03 (Portugal)
    • Norway NS EN 1998-1/NA:2014-05 (Norway)
    • Slovenia SIST EN 1998-1/NA:2009-01 (Slovenia)
    • Romania SR EN 1998-1/NA:208-11 (Romania)
    • Singapore SS EN 1998-1/NA:2013-02 (Singapore)
    • Slovakia STN EN 1998-1/NA:2009-04 (Slovakia)
    • Spain UNE EN 1998-1/NA:2020-01 (Spain)
    • Italy UNI EN 1998-1/NA:2013-03 (Italy)
  • User-defined response spectra or those generated from accelerograms
  • Approach of direction-related response spectra
  • Manual or automatic selection of the relevant mode shapes for response spectra (5% rule from EC 8 applicable)
  • Result combinations by modal superimposition (SRSS or CQC rule) and directional superimposition (SRSS or 100% / 30% rule)
  • Accidental torsional actions can be taken into account automatically
  • Signed results based on the dominant mode shape can be displayed


The input parameters relevant for the selected standards are suggested by the program in accordance with the rules. Furthermore, it is possible to enter response spectra manually.

Load cases of the type Response Spectrum Analysis define the direction in which response spectra act and which eigenvalues of the structure are relevant for the analysis. In the spectral analysis settings, you can define details for the combination rules, damping, if applicable, as well as zero-period acceleration (ZPA).



Equivalent static loads are generated separately for each relevant eigenvalue and excitation direction. They are saved in a load case of the type Response Spectrum Analysis and a linear static analysis is performed in RFEM/RSTAB.



The load cases of the type Response Spectrum Analysis contain the generated equivalent loads. First, the modal contributions are superimposed with the SRSS or CQC rule. Signed results based on the dominant mode shape are possible.

Afterwards, the directional components of earthquake actions are combined with the SRSS or 100% / 30% rule.

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1,120.00 USD

The price is valid for United States.