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When I tried to pick the imperfections in FE-LTB, the message "Diagonal coefficient of matrix < 0"="" was=""> What have I done wrong?
Often, such an instability in FE-LTB can be explained by inaccurate support conditions or release definitions.
The determination of the critical load factor provides the stability load of the analyzed structural system.
In the numerical calculation, this stability load 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.