Load Combinations of Horizontal Beam-Like Structures

Tips & Tricks

In the case of horizontal beam‑like supporting structures, the favourable and unfavourable load components of the permanent actions should be considered separately. In RFEM and RSTAB, this is possible as follows.

  1. Create other load cases for permanent actions in addition to the ‘Self‑weight’ load case. These include favourable load components. The automatic consideration of the self‑weight must be deactivated.
  2. Apply the weight of the structure and other potential structures in the relieving areas.
    Important: The loads are negative, but recognized in full. The reduction follows in the load combination first. Therefore, you can use load cases for different design states (load capacity, static equilibrium).
    Tip: The self‑weight can be automatically determined by the parameterized input from the cross‑section library: GetCSPar (CrossSection(number); "g")*10
  3. If you want to use the ‘Automatic Generation from Combinations’, you have to assign the additional ‘permanent’ load cases to a separate action category. For this purpose, there is the Category 1.C (permanent actions / imposed load). Finally, you should adjust the partial safety factors for this category. You can apply a new national annex in this case.
    Note: A separate consideration of favourable permanent actions is usually not required.
  4. The partial safety factors result from the difference between γG,sup and γG,inf.

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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

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