- Response spectra of the following standards are implemented:
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EN 1998-1:2010 + A1:2013 (European Union) -
DIN 4149:2005-04 (Germany) -
SIA 261:2020-08 (Switzerland) -
SIA 261:2014-07 (Switzerland)
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ASCE/SEI 7-22 (USA) -
ASCE 7 | 2016 - IBC | 2018 (USA)
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ASCE 7 | 2010 - IBC | 2012/15 (USA)
-
ASCE 7 | 2005 - IBC | 2009 (USA)
-
IBC 2000 (USA)
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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) -
SANS 10160-4:2017 (South Africa) -
SBC 103:2018 (Saudi Arabia) -
TBEC:2018 (Türkiye)
-
- The following National Annexes according to EN 1998‑1 are available:
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DIN EN 1998-1/NA:2023-11 (Germany)
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ÖNORM EN 1998-1/NA:2017-07 (Austria) -
SN 1998-1/NA:2019-12 (Switzerland)
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1998-1/NA:2013-05 (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 (United Kingdom) -
CSN EN 1998-1/NA:2016-09 (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)
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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
Response Spectrum Analysis | Features
Do you have any questions?
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To evaluate whether it is also necessary to consider the second-order analysis in a dynamic calculation, the sensitivity coefficient of interstory drift θ is provided in EN 1998‑1, Sections 2.2.2 and 4.4.2.2. It can be calculated and analyzed using RFEM 6 and RSTAB 9.
The coefficient θ is calculated as follows:$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r}{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;$$
The coefficient θ is calculated as follows:$$\mathrm\theta\;=\;\frac{\displaystyle{\mathrm P}_\mathrm{tot}\;\cdot\;{\mathrm d}_\mathrm r}{{\mathrm V}_\mathrm{tot}\;\cdot\;\mathrm h}\;$$
Both the determination of natural vibrations and the response spectrum analysis are always performed on a linear system. If nonlinearities exist in the system, they are linearized and thus not taken into account. They are caused by, for example, tension members, nonlinear supports, or nonlinear hinges. This article shows how you can handle them in a dynamic analysis.
In this article, you will learn how to model and design cable structures in RFEM 6 or RSTAB 9.
This article describes and explains the influence of bending stiffness of cables on their internal forces. Furthermore, the text provides information on how this influence can be reduced.
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 that 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 the 100% / 30% rule.
Use the "Independent mesh preferred" option in the FE mesh settings to create an independent FE mesh for the integrated objects. This allows you to generate a significantly more detailed and precise FE mesh for individual objects that are integrated into one another.
How can I create a response spectrum according to ASCE 7‑22?
What is the difference between the RANS, URANS, and DDES turbulence models?
When performing steel design in RFEM 6 or RSTAB 9, I get the warning that the torsion is neglected in the stability design checks. What is the reason for this, and how can I avoid the warning message?
How many updates does Dlubal provide for RFEM 6/RSTAB 9 each month?
Where can I find the calculation parameters in RFEM 6?
I cannot activate the Cutting Patterns add-on. What is the reason?
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