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Is it possible to set a plastic calculation of the internal forces in RSTAB or are the internal forces exclusively calculated elastically?


In RSTAB, it is also possible to determine plastic internal forces. To do this, you have to select a plastic hinge as nonlinearity by using the member properties (see Figure 1). However, this does not include an interaction of the plastic internal forces. Another possibility is to set releases with nonlinear properties directly. However, you have to use this method to estimate beforehand where these joints form.

RFEM provides the option to select a corresponding material model (see Figure 2).


Plastic internal forces Plastic member properties Plastic material Nonlinear material Plastic hinge



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  • Updated 8 November 2020

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RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD