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Structural FEA Software RFEM 6 | Automatic Generation of Combinations
Automatic Generation of Load Combinations
Structural Analysis Models to Download
“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 RFEM, you can automatically create action and load combinations as well as design situations according to ASCE 7, 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.
Standards
The Base Data dialog box includes a wide range of standards and the option to create 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
For the European standards (EC), the following National Annexes are available:
DIN | 2012-08 (Germany)
CEN | 2010-04 (the European Union)
BDS | 2013-03 (Bulgaria)
BS | 2009-06 (the United Kingdom)
CSN | 2015-05 (the Czech Republic)
CYS | 2010-06 (Cyprus)
DK | 2013-09 (Denmark)
ELOT | 2009-01 (Greece)
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 (the 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
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.
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