Frame Analysis Software RSTAB 9 | Automatic Generation of Combinations

Standards

With Dlubal, you can safely and easily design structures all over the world. Select from a large number of standards in the Base Data. You can also decide whether to create the combinations automatically.
The following standards are available:

• EN 1990
• EN 1990 | Timber
• EN 1990 | Cranes
• EN 1990 | Geotechnics
• EN 1990 | Base + Timber
• EN 15512
• ASCE 7
• ASCE 7 | Timber
• ACI 318
• IBC
• CAN/CSA
• NBCC
• NBCC | Timber
• NBR 8681
• IS 800
• SIA 260
• SIA 260 | Timber
• BS 5950
• GB 50009
• GB 50068
• GB 50011
• CTE DB-SE
• SANS 10160-1
• NTC
• NTC | Timber
• AS/NZS 1170.0
• SP 20.13330:2016
• TSC | Steel
  

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

• DIN | 2012-08 (Germany)
• CEN | 2010-04 (European Union)
• BDS | 2013-03 (Bulgaria)
• BS | 2009-06 (United Kingdom)
• CSN | 2015-05 (Czech Republic)
• CYS | 2010-06 (Cyprus)
• DK | 2013-09 (Denmark)
• ELOT | 2009-01 (Greece)
• EVS-EN 1990:2002+NA:2002 (Estonia)
• IS | 2010-04 (Ireland)
• LST | 2012-01 (Lithuania)
• LU | 2020-03 (Luxembourg)
• LVS | 2015-01 (Latvia)
• MS | 2010-02 (Malaysia)
• NBN | 2015-05 (Belgium)
• NEN | 2011-12 (Netherlands)
• NF | 2011-12 (France)
• NP | 2009-12 (Portugal)
• NS | 2016-05 (Norway)
• ÖNORM | 2013-03 (Austria)
• PN | 2010-09 (Poland)
• SFS | 2010-09 (Finland)
• SIST | 2010-08 (Slovenia)
• SR | 2006-10 (Romania)
• SS | 2008-06 (Singapore)
• SS | 2019-01 (Sweden)
• STN | 2010-01 (Slovakia)
• CPM | 2011-11 (Belarus)
• UNE | 2010-07 (Spain)
• UNI | 2010-10 (Italy)

Load Cases and Combinations

To ensure that your structures can cope with all loads, take a look at the "Load Cases and Combinations" dialog box. Here you can create and manage load cases. Furthermore, you can also generate action and load combinations as well as design situations here. You can assign the action categories of the selected standard to the individual load cases. If you have assigned several loads 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, you have come to the right place. If you use them in the ultimate and the serviceability limit state, you can select various design situations according to the standard (for example, ULS (STR/GEO) - permanent/transient, SLS - quasi-permanent, and others). Optionally, you can also integrate imperfections in the combination and determine load cases that should not be combined with other load cases (for example, construction load for roof not combined with snow load).

Accidental Design Situation

Do your structures also have to withstand unusual conditions? Then select the "accidental" design situation. Here, the accidental actions such as earthquake, explosion loads, collisions, and many others, are considered automatically. Furthermore, when using German standards, you can select the "Accidental - Snow" design situation to consider the North German Plain automatically as well.

Action Combinations

Do you want to combine actions? Then use this feature. Here, the actions are automatically superimposed in accordance with combination expressions and then displayed as "action combinations." You can define which action combinations will eventually be 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

RFEM 6 offers you a wide range of helpful and efficient functions for working with load combinations. You can add the load cases included in load combinations together and then calculate them in consideration of the corresponding factors (partial safety and combination factors, coefficients regarding consequence classes, and so on). Generate the load combinations automatically in compliance with the combination expressions of the standard. You can perform the calculation according to the linear static analysis, second-order analysis, or large deformation analysis, as well as for post-critical analysis. Optionally, you can define whether the internal forces should be related to the deformed or non-deformed structure.

Result Combinations

Rely on RFEM 6 even in the case of result combinations. First, you can have the contained load cases calculated in the result combinations. 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, and other result combinations. Internal forces are added together by default. However, you have the option of a square addition, which is relevant for dynamic analysis.

Modifying Stiffnesses / Considering Initial Deformations

Do not lose track of stiffnesses and initial deformations. In the individual load cases or combinations, you have the option to modify the stiffnesses of materials, cross-sections, nodal, line and surface supports, and member and line hinges for all or selected members. You can also consider initial deformations from other load cases or load combinations.