Nonlinear analysis
In this chapter, the basic precondition for successful run of non-linear calculation are described .
Project data
Besides standard linear calculation there is also available nonlinear calculation respecting physical nonlinearity of steel fibre concrete. There are in fact two options:
- physical non-linear calculation for fibre concrete (without standard reinforcement)
- physical non-linear calculation for fibre concrete with standard reinforcement
The activation of this feature is done in Project data > Nonlinearity > Concrete >2D physical non-linearity (FRC)
The usage of the calculation is limited for
- Structure type "General XYZ"
- Post processing environment "v17"
- "General plasticity" is not possible to combine with this functionality
Material diagrams
When the settings above is applied then there is a new option (automatically switch ON) for each steel fibre concrete material - "Non-linear behaviour"
When this checkbox is ON then there is a possibility to define "Stress/strain diagram for non-linear analysis". There are four types of stress/strain diagram
- By code without tension part
- By code with tension part and peak - default
- By code with tension part and without peak
- User definition - when this is selected then user can define its own stress/strain diagram based on the three option above
There are also two option for definition of diagram for non-linear calculation for concrete in compression
- parabolic
- linear-constant
