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FAQ 003116 EN

29 May 2019

Gerhard Rehm Add-on Modules RF-STEEL EC3 STEEL EC3

Which degrees of freedom are considered for the eigenvalue solver for the determination of the ideal branching moment for lateral-torsional buckling (M cr ) in the RF- / STEEL EC3 add- on module?

Answer

For the design with the equivalent member method and the general method, four degrees of freedom are considered in the eigenvalue solver. They are:

  • u Y ' (displacement from plane)
  • φ X ' (rotation about the X'-axis)
  • φ Z ' (rotation about the Z'-axis)
  • ω (warping)
When the add-on module RF- / STEEL Warping Torsion is activated, there are seven degrees of freedom:

  • u x (displacement in x)
  • u y (displacement in y)
  • u z (displacement in z)
  • φx (Verdrehung um die x-Achse)
  • φy (Verdrehung um die y-Achse)
  • φz (Verdrehung um die z-Achse)
  • ω (Verwölbung)

Keywords

Junction moment Lateral-torsional buckling Axis-value-solver Degree of freedom General Methods Equivalent member method Warping torsion

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RFEM Steel and Aluminium Structures
RF-STEEL EC3 5.xx

Add-on Module

Design of steel members according to Eurocode 3

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STEEL EC3 8.xx

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Design of steel members according to Eurocode 3

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