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At the very beginning, we must check the settings in the material manager, verify that non-linear stiffness is selected, and if required, to make necessary settings. This non-linear stiffness is selected by default in a new project where Physical non-linearity is adjusted on the Functionality tab of the Project setup.
If we have adjusted the non-linear stiffness of the material, we can adjust its stress-strain diagram.
The same can be done for the material of reinforcement.
In a physically non-linear calculation the stress-strain diagrams are NOT taken as defined in the appropriate standard, bus AS defined by the user in the material manager.
To sum up. If we open the material manager and start editing of a selected material, we can (better must) select the non-linear stiffness. Then we can select the stress-strain diagram that corresponds to our particular situation. Alternatively, we can input our own stress-strain diagram that can be input "from scratch" or derived from values stipulated in a standard. The stress-strain diagram can contain even a declining branch. Even such a situation can be successfully analysed by means of the method implemented in SCIA Engineer.