Which degrees of freedom are considered in the eigenvalue solver to determine the ideal elastic critical moment (Mcr) in the RF‑/STEEL EC3 add‑on module?

Answer

For the design using Equivalent Member Method and General Method, there are four degrees of freedom considered in the eigenvalue solver. These are as follows:

  • uY' (displacement from the plane)
  • φX' (rotation about the X'-axis)
  • φZ' (rotation about the Z'-axis)
  • ω (warping)
If the RF‑/STEEL Warping Torsion add-on module is activated, there are seven degrees of freedom available:

  • ux (displacement in x)
  • uy (displacement in y)
  • uz (displacement in z)
  • φx (rotation about the x-axis)
  • φy (rotation about the y-axis)
  • φz (rotation about the z-axis)
  • ω (warping)

Keywords

Elastic critical moment Lateral-torsional buckling Torsional-flexural buckling Eigenvalue solver Degree of freedom General method 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

Price of First License
1,480.00 USD
RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD