Why do the zeta-coefficients used in BGDK differ from the coefficients in literature references?

Answer

The coefficient ζ for the consideration of the pressure force distribution in the flange is a correction factor to determine the critical buckling moment Mcr for certain boundary conditions and loads.

In RF-/LTB, this correction factor ζ always refers to the largest bending moment of the equivalent member. The literature references often give the coefficient ζ in relation to the center of the equivalent member (see also RF-/LTB Manual).

However, the RF-/LTB also provides an option to define the zeta-coefficient manually. For this, select the option 'Assign LC/CO Individually' in chapter Method of Determining Mcr (see Figure).

Keywords

Zeta Critical buckling moment Correction factor Coefficient

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