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FAQ 003618 EN

1 October 2019


What is the reason for displaying the message that the program does a nonlinear analysis each time during the calculation?


Even if the program does not calculate any nonlinear material it may calculate a nonlinear algebraic equation according to II. or III. order analysis. Therefore, the design is nonlinear not only because of geometrical material non-linearities but also because of the nonlinear physical analysis method.
The attached video demonstrates that when the nonlinear behavior of the tension member is not considered in the calculation, linear design in the load cases and nonlinear design in the load combination is displayed. The reason for this is the nonlinear design according to II. order theory in the load combination.  


Nonlinear Physical Geometrical


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RFEM Main Program
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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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