Structural FEA Software RFEM 5 | Automatic Generation of Combinations
Automatic Generation of Load Combinations
In RFEM, you can automatically create load and result combinations according to Eurocode and other international standards in compliance with the corresponding combination expressions. In a clearly arranged window, it is possible to copy, add, or renumber load cases, for example. Furthermore, you can manage the load cases and combinations in Tables 2.1 – 2.6.
The General Data dialog box includes a wide range of standards and the option to create combinations automatically. The following standards are available:
- EN 1990: 2002
- EN 1990 + EN 1995: 2004 (timber)
- EN 1990 + EN 1991-2; Road bridges
- EN 1990 + EN 1991-3; Cranes
- EN 1990 + EN 1997
- DIN 1055-100: 2001-03
- DIN 1055-100 + DIN 1052: 2004-08 (timber)
- DIN 1055-100 + DIN 18008 (glass)
- DIN 1052 (simplified) (timber)
- DIN 18800: 1990
- ASCE 7-10
- ASCE 7-10 NDS (timber)
- ACI 318-14
- IBC 2015
- CAN/CSA S 16.1-94: 1994
- NBCC: 2005
- NBR 8681
- IS 800: 2007
- SIA 260: 2003
- SIA 260 + SIA 265: 2003 (timber)
- BS 5950-1: 2000
- GB 50009-2012
- CTE DB-SE
For the European standards (EC), the following National Annexes are available:
- DIN EN 1990/NA: 2009-05 (Germany)
- NBN EN 1990 - ANB: 2005 (Belgium)
- BDS EN 1990: 2003/NA: 2008 (Bulgaria)
- DK EN 1990/NA: 2007-07 (Denmark)
- SFS EN 1990/NA: 2005 (Finland)
- NF EN 1990/NA: 2005/12 (France)
- ELOT EN 1990: 2009 (Greece)
- UNI EN 1990/NA: 2007-07 (Italy)
- IS EN 1990: 2002 + NA: 2010 (Ireland)
- LVS EN 1990: 2003/NA: 2010 (Latvia)
- LST EN 1990/NA: 2010-11 (Lithuania)
- LU EN 1990/NA: 2011-09 (Luxembourg)
- MS EN 1990: 2010 (Malaysia)
- NEN EN 1990/NA: 2006 (Netherlands)
- NS EN 1990/NA: 2008 (Norway)
- ÖNORM EN 1990: 2007-02 (Austria)
- NP EN 1990: 2009 (Portugal)
- PN EN 1990/NA: 2004 (Poland)
- SR EN 1990/NA: 2006-10 (Romania)
- SIST EN 1990: 2004/A1: 2005 (Slovenia)
- SS EN 1990: 2008 (Singapore)
- SS EN 1990/FSO 2010: 28 (Sweden)
- STN EN 1990/NA: 2009-08 (Slovakia)
- UNE EN 1990 2003 (Spain)
- CSN EN 1990/NA: 2004-03 (Czech Republic)
- BS EN 1990/NA: 2004-12 (United Kingdom)
- CPM EN 1990/NA: 2011 (Belarus)
- CYS EN 1990: 2002 (Cyprus)
In the "Edit Load Cases and Combinations" dialog box, you can create and edit load cases as well as generate action, load and result combinations. It is possible to assign various action types to the individual load cases in accordance with the selected standard. If several loads have been assigned to one action type, they can act simultaneously or alternatively (for example wind from the left or right).
For the combination of actions 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). 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 (for example construction load for roof not combined with snow load).
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.
There are three options to reduce the number of combinations. The first two procedures are only available for the generation of load combinations but not for result combinations.
The first option allows for automatic analysis of all load case results (internal forces, deformations, etc.) of selected elements. Then, the program will generate only those combinations which include the load cases producing a maximum or minimum. In addition, you can define a maximum number of relevant load cases, or neglect load cases with a very small contribution to the maximum and minimum values.
The second option allows for automatic evaluation of generated temporary or user-defined result combinations. Then, only the governing load combinations are created.
The third option to reduce the number of generated combinations is to classify only selected actions as leading actions.
The actions are automatically superimposed in accordance with combination expressions and then 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.
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, and others). The load combinations can be created automatically in compliance with the combination expressions of the standard. It is possible to perform the calculation according to the linear static analysis, second-order analysis or large deformation analysis as well as for postcritical failure. Optionally, you can define whether the internal forces are relative to a deformed or non-deformed structure.
The load cases included in 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 and 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.
In the individual load cases or combinations, there is the option to modify the stiffness of materials, cross-sections, nodal, line and surface supports, as well as member end releases and line hinges for all or the selected members. Furthermore, it is possible to consider initial deformations from other load cases or load combinations.
Do you have any questions about our products or which are best suited for your design projects? Contact us via phone, email, or chat or find suggested solutions and useful tips on our FAQ page available 24/7.
In order to create a surface model with failing supports close to reality, an option called "Failure if contact perpendicular to surfaces failed" is available in RFEM 5 for contact solids under "Contact Parallel to Surfaces".
The number of degrees of freedom in a node is no longer a global calculation parameter in RFEM (6 degrees of freedom for each mesh node in 3D models, 7 degrees of freedom for the warping torsion analysis). Thus, each node is generally considered with a different number of degrees of freedom, which leads to a variable number of equations in the calculation.
This modification speeds up the calculation, especially for models where a significant reduction of the system could be achieved (e.g. trusses and membrane structures).
How can I permanently save the parameters in the "Units and Decimal Places" dialog box?
- Can I export a response spectrum from RFEM 6 and use it in RFEM 5, for example?
- I have deactivated objects by load case. Why are they still considered in the calculation in the corresponding load case?
- What is the maximum number of reinforcement groups that can be created in a design case in RF‑CONCRETE Surfaces?
- I would like to enter a large spring constant. Is it possible?
- How can I update the graphics driver, and where do I find the current driver versions?
- How can I display the internal forces of a coupling member or rigid member?
- I have activated values on surfaces in grid points, but only get the extreme values displayed. How can I display all values in all grid points as desired?
- How do I get the current authorization file for RFEM 5, RSTAB 8 and other stand-alone programs?
- Why are the free line loads not displayed completely at certain locations after copying them, for example?
Customers who bought this product also bought
Design of steel members according to Eurocode 3
Stress analysis of steel surfaces and members
Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)
Module Extension for RFEM
Extension of the modules for reinforced concrete design by the Eurocode 2 design
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Stability analysis according to the eigenvalue method
Reinforced concrete design according to the model column method (method based on nominal curvature)
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052
Seismic and static load analysis using the multi-modal response spectrum analysis
Consideration of nonlinear material laws
Analytical deformation analysis of plate structures consisting of reinforced concrete
Generation of equivalent geometric imperfections and pre-deformed initial structures for nonlinear calculations