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


Members with the member type 'Spring' or 'Dashpot' have only axial 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 a spring should be applied in the structure, it acts only in one direction; in the other two directions (local y- and z-direction), this member type must receive 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

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