Frame Analysis Software RSTAB 9 | Automatic Generation of Combinations

Structural Engineering Analysis & Design Software

The 3D structural frame analysis program RSTAB is the ideal tool for the design of beam, frame, or truss structures consisting of steel, reinforced concrete, timber, aluminum, or other materials.

With RSTAB you can easily and quickly define a structural model and then calculate the internal forces, deformations, and support reactions. Various add-ons that take into account the material and standard-specific requirements are available for the design.

  • RSTAB 9 for Frames and Trusses

Automatic Generation of Combinations

Structural Analysis Models to Download

Models to Download

Select numerous structural models to utilize them for training purposes or for your projects.

Easy Modeling of Structures

“I really enjoy working with Dlubal Software programs. The structure generation and modification can proceed smoothly:

  • Manageability of functions in the menu and movability in space
  • Data transparency: checks, options to modify and transfer data

I am happy that I switched over to Dlubal Software!”

In RSTAB, you can automatically create action and load combinations as well as design situations according to Eurocode and other international standards in compliance with the corresponding combination rules. In a clearly arranged window, you can also copy or add load cases, for example. In addition, you can manage the load cases and combinations in the tables.



The Base Data dialog box includes a wide range of standards and the option to create combinations automatically. The following standards are available:

  • European Union EN 1990
  • European Union EN 1990 | Timber
  • European Union EN 1990 | Cranes
  • European Union EN 1990 | Geotechnics
  • European Union EN 1990 | Base + Timber
  • European Union EN 15512
  • United States ASCE 7
  • United States ASCE 7 | Timber
  • United States ACI 318
  • United States IBC
  • Canada CAN/CSA
  • Canada NBCC
  • Canada NBCC | Timber
  • Brazil NBR 8681
  • India IS 800
  • Switzerland SIA 260
  • Switzerland SIA 260 | Timber
  • United Kingdom BS 5950
  • People's Republic of China GB 50009
  • People's Republic of China GB 50068
  • People's Republic of China GB 50011
  • Spain CTE DB-SE
  • South Africa SANS 10160-1
  • Mexico NTC
  • Mexico NTC | Timber

For the European standards (EC), the following National Annexes are available:

  • Germany DIN | 2012-08 (Germany)
  • European Union CEN | 2010-04 (the European Union)
  • Bulgaria BDS | 2013-03 (Bulgaria)
  • United Kingdom BS | 2009-06 (the United Kingdom)
  • Czech Republic CSN | 2015-05 (the Czech Republic)
  • Cyprus CYS | 2010-06 (Cyprus)
  • Denmark DK | 2013-09 (Denmark)
  • Greece ELOT | 2009-01 (Greece)
  • Ireland IS | 2010-04 (Ireland)
  • Lithuania LST | 2012-01 (Lithuania)
  • Luxembourg LU | 2020-03 (Luxembourg)
  • Latvia LVS | 2015-01 (Latvia)
  • Malaysia MS | 2010-02 (Malaysia)
  • Belgium NBN | 2015-05 (Belgium)
  • Netherlands NEN | 2011-12 (the Netherlands)
  • France NF | 2011-12 (France)
  • Portugal NP | 2009-12 (Portugal)
  • Norway NS | 2016-05 (Norway)
  • Austria ÖNORM | 2013-03 (Austria)
  • Poland PN | 2010-09 (Poland)
  • Finland SFS | 2010-09 (Finland)
  • Slovenia SIST | 2010-08 (Slovenia)
  • Romania SR | 2006-10 (Romania)
  • Singapore SS | 2008-06 (Singapore)
  • Sweden SS | 2019-01 (Sweden)
  • Slovakia STN | 2010-01 (Slovakia)
  • Belarus CPM | 2011-11 (Belarus)
  • Spain UNE | 2010-07 (Spain)
  • Italy UNI | 2010-10 (Italy)

Load Cases and Combinations

In the "Load Cases & Combinations" dialog box, you can create and manage load cases, and generate action and load combinations as well as design situations. You can assign the action categories of the selected standard to the individual load cases. If several loads have been assigned to an action category, they can act simultaneously or alternatively (for example, either wind from the left or wind from the right).


Combination Expressions

For the combination of actions in the ultimate and the serviceability limit state, you can select various design situations according to the standard (e.g. ULS (STR/GEO) - permanent/transient, SLS - quasi-permanent, and others). Furthermore, there is the option to integrate imperfections in the combination and to determine load cases that should not be combined with other load cases (e.g. construction load for roof not combined with snow load).


Accidental Design Situation

The "Accidental" design situation automatically considers accidental actions such as earthquake, explosion loads, collisions, and others. When using German standards, you can select the "Accidental - Snow" design situation to consider the North German Plain automatically as well.


Action Combinations

The actions are automatically superimposed in accordance with the combination expressions and displayed as so-called "action combinations". It is possible to define which action combinations will be eventually used for the generation of load or result combinations. Based on the created action combinations, you can estimate how the combination expressions affect the number of combinations.


Load Combinations

The load cases included in load combinations are added together and then calculated in consideration of the corresponding factors (partial safety and combination factors, coefficients regarding consequence classes, etc.). The load combinations can be created automatically in compliance with the combination expressions of the standard. The calculation can be performed according to the geometrically linear, second-order, or large deformation analysis, or as per the post-critical analysis. Optionally, you can define whether the internal forces should be related to the deformed or non-deformed structure.


Result Combinations

The load cases included in the result combinations are calculated first. Then, the results are superimposed by taking into account the corresponding factors. In the result combinations, you can superimpose the results of load cases, load combinations, as well as other result combinations. Internal forces are added together by default. However, there is the option of a square addition, which is relevant for dynamic analysis.


Modifying Stiffnesses / Considering Initial Deformations

In the individual load cases or combinations, there is the option to modify the stiffnesses of materials, cross-sections, nodal, line and surface supports, as well as member hinges and line hinges for all or selected members. Furthermore, it is possible to consider initial deformations from other load cases or load combinations.


2,550.00 USD

The price is valid for United States.

Online Training | English

Eurocode 5 | Timber Structures According to DIN EN 1995-1-1

Online Training 15 June 2022 8:30 AM - 12:30 PM CEST

Webservice & API in RFEM 6

Webservice & API in RFEM 6

Webinar 20 April 2022 2:00 PM - 3:00 PM CEST

Stability and Torsional Warping Analysis in RFEM 6

Stability Analysis and Torsional Warping (7 DOF) in RFEM 6

Webinar 17 March 2022 2:00 PM - 3:00 PM CET

Design Aluminum Structures \n in RFEM 6 and RSTAB 9

Model and Design Aluminum Structures in RFEM 6 and RSTAB 9

Webinar 27 January 2022 2:00 PM - 3:00 PM CET

Seismic Design According to EC 8 in RFEM 6 and RSTAB 9

Seismic Design According to Eurocode 8 in RFEM 6 and RSTAB 9

Webinar 2 December 2021 2:00 PM - 3:00 PM CET

Timber Structure Design in RFEM 6 and RSTAB 9

Model and Design Timber Structures in RFEM 6 and RSTAB 9

Webinar 11 November 2021 2:00 PM - 3:00 PM CET

Modeling and Design of Steel Structures in RFEM 6 and RSTAB 9

Modeling and Design of Steel Structures in RFEM 6 and RSTAB 9

Webinar 20 October 2021 2:00 PM - 3:00 PM CEST

New Features in RFEM 6 \n and RSTAB 9

New Features in RFEM 6 and RSTAB 9

Webinar 15 October 2021 10:00 AM - 11:00 AM CEST

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

Special Solutions

First, the two-part Optimization & Costs / CO2 Emission Estimation add-on finds suitable parameters for parameterized models and blocks via the artificial intelligence (AI) technique of particle swarm optimization (PSO) for compliance with common optimization criteria. Second, this add-on estimates the model costs or CO2 emissions by specifying unit costs or emissions per material definition for the structural model.

Price of First License
1,480.00 USD