Why is it always displayed during the calculation that the program performs a nonlinear analysis? 

Answer

Even if the program does not calculate a nonlinear material, it may calculate a nonlinear algebraic equation according to the second-order or large deformation analysis. Therefore, the design is not only nonlinear because of the geometrical material nonlinearities, but also because of the nonlinear physical analysis method.
The attached video shows that if the nonlinear behavior of the tension beam is not considered during the calculation, a linear analysis is displayed in load cases and a nonlinear analysis is displayed in load combinations. The reason for this is the nonlinear design according to second-order analysis in the load combination. 

Keywords

Nonlinear Physical Geometrical

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