Response Spectrum Analysis for RFEM 6 / RSTAB 9

Product Description

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Extension of Modal Analysis for Multi-Modal Response Spectrum Analysis


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Forces of nature are a natural enemy of every structural engineer. But don't worry, you can perform your calculations in advance in the event of an earthquake. The Response Spectrum Analysis add-on will help you with this. It performs seismic analyses using the multi-modal response spectrum method. You can create the response spectra required for this in compliance with the standards or user-defined. The program use them to generate the equivalent static forces.

The add-on includes even more for you, for example, an extensive library of accelerograms from seismic zones. You can use them to generate the response spectra as well.

Please Note: The seismic analysis using the multi-modal response spectrum analysis requires the analysis of natural vibrations in the Modal Analysis add-on.



  • 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/SEI 7-22 (USA)
    • 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 2020 (Canada)
    • Spain NCSE 02:2009 (Spain)
    • Netherlands NPR 9998:2020-12 (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:2021-07 (Germany)
    • 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)
    • Bosnia and Herzegovina BAS EN 1998-1/NA:2018 (Bosnia and Herzegovina)
    • 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)
    • Croatia HRN EN 1998-1/NA:2011-06 (Croatia)
    • 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)
    • Hungary MSZ EN 1998-1/NA:2013-07 (Hungary)
    • 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:2021-06 (Norway)
    • Slovenia SIST EN 1998-1/NA:2009-01 (Slovenia)
    • Romania SR EN 1998-1/NA:2008-11 (Romania)
    • Serbia SRPS EN 1998-1/NA:2018-12 (Serbia)
    • 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
  • Direction-relative response spectrum 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)
  • Accidental torsional actions can be taken into account automatically
  • Signed results based on the dominant mode shape can be displayed


The Dlubal structural analysis software does a lot of work for you. The input parameters, which are relevant for the selected standards, are suggested by the program in accordance with the rules. Furthermore, you can 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), and zero-period acceleration (ZPA).



Did you know? Equivalent static loads are generated separately for each relevant eigenvalue and excitation direction. These loads are saved in a load case of the Response Spectrum Analysis type and RFEM/RSTAB performs a linear static analysis.



The load cases of the type Response Spectrum Analysis contain the generated equivalent loads. First, the modal contributions have to be superimposed with the SRSS or CQC rule. In this case, you can use the signed results based on the dominant mode shape.

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


Response Spectrum Analysis

  • User-defined response spectra or those generated from accelerograms
  • Approach of direction-related response spectra
  • Automatic consideration of accidental torsional effects
  • Manual or automatic selection of the relevant mode shapes for response spectra (5% rule)
  • Result combinations by modal superimposition (SRSS or CQC rule) and directional superimposition (SRSS or 100% / 30% rule)
  • Automatic generation of an exceptional design situation for the subsequent design

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The prices apply to the use of the software in all countries.

3D Model of the Vocational School in RFEM (© Eggers Tragwerksplanung GmbH)

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