I have defined a pre-deformation in RSTAB. If FE-LTB takes over the loads, why not the imperfection?

Answer

According to EN 1993-1-1 and DIN 18800 Part 2, it is necessary to get specified the equivalent geometrical imperfections for the second-order calculation to determine geometric and structural imperfections as well. This pre-deformation should be applied affinely to the lowest buckling or lateral-torsional buckling mode.

Therefore, in the program FE-LTB, the eigenmode belonging to the smallest eigenvalue is calculated (preliminary eigenvalue analysis) and then chosen as initial deformation mode. The imperfection approach is then carried out by the user scaling the eigenmode.

Thus, in RF-/FE-LTB, the pre-deformation is based on the eigenmode. The imperfections defined in RFEM/RSTAB are irrelevant and are therefore not adopted.

Keywords

Imperfection Precamber Eigenmode Equivalent imperfection

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