FAQ 000401 | I would like to use couplings in a model. What is the difference between the coupling, dummy rigid and rigid members?

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First Steps with RFEM

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We provide hints and tips to help you get started with the basic program RFEM.

08/28/2019

000274

Robert Vogl

RFEM

RSTAB

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Question

I would like to use couplings in a model. What is the difference between the coupling, dummy rigid and rigid members?

Answer

A Coupling member is a virtual member with definable rigid or hinged properties. There are four options available to couple the start and end node. The axial and shear forces or torsion and bending moments are directly transferred from node to node. Couplings allow you to model special situations for the force and moment transmission.

If specifying Dummy Rigid as a description of the cross-section, you can use a member with a high degree of stiffness, taking into account releases or other member properties. In RFEM 5 and RSTAB 8, Dummy Rigid was replaced by the Rigid member. However, for compatibility reasons, it is still possible to use Dummy Rigid.

The stiffnesses in these members are calculated in relation to the member length L:

  • EAx = GIx = 1013 ⋅ L
  • EIy = EIz = 1013 ⋅ L3
  • GAy = GAz = 1015 ⋅ L (RFEM) or GAy = GAz = 0 (RSTAB)

where

EAx is the strain stiffness 

GIx is the torsional stiffness 

EI is the flexural stiffness 

GA is the shear stiffness 

Keywords

Dlubal FAQ coupling coupling member rigid member dummy rigid stiffness Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal

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  • Updated 02/24/2021

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