29 July 2019

FAQ 003347 EN

Paul Kieloch

Modeling | Loading



Eurocode 0

Can I create or generate parallel load combinations for the geometrically linear analysis and the second-order analysis (including imperfections) in RFEM? 


Yes, it is possible.  

If you activate the option to create combinations automatically in RFEM or RSTAB, load combinations for the "ULS" design situation, for example, are set automatically according to the second-order analysis. 

In this way, you can obtain a list of load combinations based on the defined load cases, which are calculated according to the second-order analysis. The consideration of imperfection load cases can also be activated.

To generated the load combinations according to the geometrically linear analysis (without imperfections) in addition to the existing load combinations calculated according to the second-order analysis including imperfection, you can create another combination expression for this. In this additional combination, you can select the "ULS" design situation now. However, you can only select the "geometrically linear analysis" as a method of analysis and deselect the imperfection load cases. 

As a result, you obtain the load combinations according to the second-order analysis including imperfection (marked in blue in the figure below) and the load combinations according to the geometrically linear analysis without imperfection (marked in red in the figure below). 

This approach can be used to perform the stability analysis according to the second-order analysis (including imperfection) on a part of the structure and according to the equivalent member method or model column method on the individual structural components, for example. 

Optionally, it is also possible to control the numbering of the individual CO groups in advance in the "Combination Expressions" tab For example, one group can start with CO 100 and the second group with CO 200. In this way, you can achieve a better overview or allocation of the COs.


Load combination Load Second-order analysis Imperfection Combination Generate


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD