In which directions do the member types "Spring" and "Dashpot" have the stiffness?


The members with the "Spring" or "Dashpot" member type only have theaxial stiffness, that is, in the direction of the local x‑direction. The bending stiffness and the stiffness perpendicular to the longitudinal member axis are negligibly small and are not considered in RFEM and RSTAB.

If there should be a spring used in the structure, it only acts in one direction; in the other two directions (local y- and z-direction), this member type must have an additional support, otherwise the system becomes unstable.


Spring Dashpot Member type Stiffness Unstable


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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

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RSTAB 8.xx

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

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