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Dipl.-Ing. (FH) Robert Vogl
2017-12-01

Calculation of Elastic Critical Moment for Lateral-Torsional Buckling Mki

Why are there differences when calculating the elastic critical moment for lateral-torsional buckling Mcr according to DIN 18800 and Eurocode 3?

Answer:

In principle, the same formulas are used for the calculation of Mcr. Nevertheless, there is a big difference:

DIN 8800‑2 simplifies the coefficient of load application point C₂ and sets it to 0.5. Eurocode 3 describes this coefficient more precisely. Depending on the load action, C₂ can be between 0.41 and 1.562.

If the load application point is placed in the center of gravity (provided that the cross-section is double-symmetric), the Mcr values are the same according to DIN 18800 and EC 3.

Manual Assignment of Coefficients
Manual Assignment of Coefficients

Author

Robert is responsible for technical documentation. He ensures that content is clearly structured, presented in an understandable way, and conveyed with technical precision.

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