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Why there are deviations when calculating the elastic critical moment Mcr according to DIN 18800‑2 and EC 3?

Answer

The calculation of M Ki is based on the same formulas. Nevertheless, there is one big difference:

DIN 18800-2 simplifies the coefficient of the load application point C 2 and sets it to 0.5. Eurocode 3 captures this factor more precisely. Depending on the load, C 2 can be between 0.41 and 1.562.

If the load application point is set in the center of gravity (assuming double-symmetrical profile), identical M Ki values result according to DIN 18800 and EC 3.

Keywords

Critical lateral-torsional buckling moment M-Ki Load application point

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