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I have calculated a box beam. Which surface results or surface stresses can I use to evaluate the buckling behavior of the web plates?


Based only on the surface results or surface stresses, it is not possible to make a statement about the buckling behavior of the box girder. The stability behavior can be analyzed with the RF-STABILITY module. It determines the buckling figures and branching load factors that allow a statement about buckling behavior.

However, buckling design is not yet provided. For this purpose, the buckling mode would have to be transferred to the model, so that it can be calculated according to the second-order theory on the imperfect system. A buckling analysis could then be performed by a stress analysis with the RF- STEEL module.

The RF-IMP module facilitates the transfer of the buckling mode. There, the equivalent geometry can be created on the basis of the stability mode, so that the buckling can be verified with a second-order stress analysis on the pre-deformed system with RF-STEEL.

The procedure in RFEM might look like this:

  • Modeling of the entire cross-section as a 3D model
  • Application of loads
  • Calculation of buckling figures with RF-STABILITY
  • Generation of a replacement model with RF-IMP
  • Calculation of load combinations according to the second-order analysis on the basis of the equivalent model
  • Stress analysis with RF-STEEL

Alternatively, you can use the PLATE -BUCKLING module to analyze the buckling behavior.

There are already some very interesting technical articles on this topic on our website.

# model @ 000750 #


Buckling Analysis Buckling behavior Buckling Buckling resistance



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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

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3,540.00 USD