If I want to select the imperfections, the message "Eigenvector Results Were Not Found" appears. Why?

Answer

The message means that your system is numerically unstable. Such instability is often due to incorrect support conditions or hinge definitions in RF-/FE-LTB. Therefore, check the degrees of freedom of the continuous member in windows 1.4 Nodal Supports and 1.7 Member Hinges.

The reason: When selecting imperfections and also in the calculation, the critical load factor will be specified. Based on this, the critical load factor of the system is determined. This is characterized by the fact that either the determinant of the stiffness matrix becomes zero, or that very high deformations occur for very small load increases in the calculation.

Keywords

Imperfection Eigenvector Diagonal coefficient Matrix Critical load factor

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RF-FE-LTB 5.xx

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FE-LTB 8.xx

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Lateral-torsional buckling analysis of members according to the second-order analysis (FEM)

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