Defining Releases Depending on Internal Forces

Tips & Tricks

In RFEM 5 and RSTAB 8, you can define nonlinear properties for member end releases. In addition to activity diagrams and the force-deformation relationship, you also have the option to simply use the signs of the internal forces as criterion for the release effectiveness. Thus, you can specify that, for example, only positive moments or negative axial forces (compression) can be transferred at the member end.

If there is, for example, a release for the displacement in the longitudinal direction of the member ux, it is not possible to transfer an axial force at the node. A release with the nonlinearity ‘Fixed if positive N’ has, for example, the effect that tension forces (positive) can and compression forces (negative) cannot be transferred at the member end. For negative axial forces, the release is effective, that is, no axial forces are transferred.


Release Nonlinearity of release Member hinge Release effect Release condition Activity diagram


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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
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