SectionNM
- Interaction Abstract Section
References
Please note the formulation is based on the first reference, which is a revised version of the one shown in the last two references.
Remarks
Strictly speaking, the SectionNM
is not a section, as a conventional section takes sectional elongation and curvature as input and computes sectional force and moment as output. The SectionNM
takes elemental deformation and resistance (which are local quantities of two end nodes) and directly compute the force and moment. Loosely speaking, the SectionNM
is a special model that accounts for two end sections simultaneously.
According to 10.1061/JSENDH.STENG-12176, the whole model can be implemented at the element level. It is chosen to separate the model into the element part (NMB*
elements) and the section part (NM2D*
and NM3D*
sections) for better code organisation.
Apart from the provided sections, other interaction surfaces can be defined.
One can define a derived class based on, for example, SurfaceNM2D
, and implement methods.
All methods take the normalised shifted resistance and equivalent plastic strain as input where is the normalised nodal resistance and is the back resistance, which is similar to the concept of back stress.
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