The analysis of the deformation capacity is tied to the assumption that the model geometry has nonlinear properties. Different types of nonlinearities are possible.
Member end hinge with nonlinearity
Member ends can be assigned nonlinear hinges. Normalized hinges for steel according to FEMA 356 [1 ] with plastic criteria are particularly suitable for the pushover analysis. They describe the ratio of occurring moment to yield moment and occurring torsion to yield torsion. The working line depends on the yield point of the cross-section.
Alternatively, you can use joints of the type Use chart with custom acceptance criteria. Nonlinear properties can also be described in the form of a regular member end hinge by defining it as #diagram diagram .
Nonlinear material properties
The pushover analysis is also able to consider a nonlinear material behavior. For example, you can use the material #masonry masonry to determine the capacity curve.
You can also define custom materials using your own working lines. The material model #isotropicDamage2D3DTab Isotropic Damage is particularly suitable for this. Detailed information on this material model can be found in a technical article .
To use user-defined working lines, you need a license for the analysis add-on material behavior Nonlinear material behavior. This add-on is described in chapter Nonlinear material behavior of the RFEM manual.