Fascinating customer projects designed with the Dlubal structural analysis software.
Response Spectrum Analysis for RFEM 6 / RSTAB 9
Extension of Modal Analysis for Multi-Modal Response Spectrum Analysis
Customer Projects
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 multimodal 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 response spectra.
Please Note: The seismic analysis using the multi-modal response spectrum analysis requires the analysis of natural vibrations in the Modal Analysis add-on.
1
Features
- Response spectra of the following standards are implemented:
EN 1998-1:2010 + A1:2013 (European Union)
DIN 4149:2005-04 (Germany)
SIA 261:2020-08 (Switzerland)- SIA 261:2014-07 (Switzerland)
ASCE/SEI 7-22 (USA)- ASCE 7 | 2016 - IBC | 2018 (USA)
- ASCE 7 | 2010 - IBC | 2012/15 (USA)
- ASCE 7 | 2005 - IBC | 2009 (USA)
- IBC 2000 (USA)
CFE Sismo:2015-07 (Mexico)
CIRSOC 103:2013-07 (Argentina)
GB 50011-2010-12 (China)
IS 1893:2016-12 (India)
NBC 2020 (Canada)
NCSE 02:2009 (Spain)
NPR 9998:2020-12 (Netherlands)
NTC 2018-01 (Italy)
P 100-1:2013-08 (Romania)
TBEC:2018 (Turkey)
- The following National Annexes according to EN 1998-1 are available:
- DIN EN 1998-1/NA:2021-07 (Germany)
- DIN EN 1998-1/NA:2011-01 (Germany)
ÖNORM EN 1998-1/NA:2017-07 (Austria)- SN 1998-1/NA:2019-12 (Switzerland)
- 1998-1/NA:2013-05 (the European Union)
BAS EN 1998-1/NA:2018 (Bosnia and Herzegovina)
BDS 1998-1/NA:2012-03 (Bulgaria)
BS EN 1998-1/NA:2008-08 (the United Kingdom)
CSN EN 1998-1/NA:2016-09 (the Czech Republic)
CYS EN 1998-1/NA:2009-03 (Cyprus)
ELOT EN 1998-1/NA:2015-04 (Greece)
HRN EN 1998-1/NA:2011-06 (Croatia)
LST EN 1998-1/NA:2010-12 (Lithuania)
ILNAS EN 1998-1/NA:2011-09 (Luxembourg)
LVS EN 1998-1/NA:2015-01 (Latvia)
MS EN 1998-1/NA:2017-01 (Malaysia)
MSZ EN 1998-1/NA:2013-07 (Hungary)
NBN EN 1998-1/NA:2011-10 (Belgium)
NF EN 1998-1/NA:2013-12 (France)
NP EN 1998-1/NA:2010-03 (Portugal)
NS EN 1998-1/NA:2021-06 (Norway)
SIST EN 1998-1/NA:2009-01 (Slovenia)- SR EN 1998-1/NA:2008-11 (Romania)
SRPS EN 1998-1/NA:2018-12 (Serbia)
SS EN 1998-1/NA:2013-02 (Singapore)
STN EN 1998-1/NA:2009-04 (Slovakia)- UNE EN 1998-1/NA:2020-01 (Spain)
- 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
2
Input
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).
3
Calculation
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.
4
Results
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.
Advantages
- User-defined response spectra or those generated from accelerograms
- Approach of direction-related response spectra
- Automatic consideration of accidental torsional effects
- Relevant mode shapes for the response spectrum can be selected manually or automatically (5% rule)
- Result combinations by modal superimposition (SRSS or CQC rule) and directional superimposition (SRSS or 100% / 30% rule)
- Automatic creation of an exceptional design situation for the subsequent design
Price
Seismic Analysis in RFEM 6 is possible by using the modal analysis and the response spectrum analysis add-ons. As a matter of fact, the general concept of the earthquake analysis in RFEM 6 is based on the creation of a load case for the modal analysis and the response spectrum analysis, respectively. The standard group for these analyses are set in the Standards II tab of the model’s Base Data.
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