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FAQ 002562 EN 4 March 2019

Adrian Langhammer Add-on Modules RF-STAGES STAGES

In the module RF-STAGES I get a message about an instability. In RFEM, the structure expects no problems. How can the topic be resolved?

Answer

Basically, the following points should be noted:

Enter the structure

The structure in RF-STAGES and RFEM may differ based on the definition in RF-STAGES. Thus, RF-STAGES may be a different structure than RFEM. In order to find an instability in a certain state of construction in this regard, one would have to map the structure in this state in RFEM and consider separately. In this context, it should also be noted that the entries between RFEM and RF-STAGES are not synchronized. For example, a rod end joint removed in RFEM is not automatically removed in the model in RF stages.

calculation theory

RF-STAGES calculates for permanent load cases Basically according to theory III. Order. Due to this calculation theory, instabilities may occur which, for example, do not occur in a load case when calculated according to theory I. order (branch load problems)

Special structural elements

Some of the structural elements present in RFEM are not supported in RF-STAGES. These structural elements may also be the cause of instability in certain cases. The following structure elements are not fully supported in RF-STAGES:

  • line joints
  • Stabbettungen
  • sets of
  • penetrations
  • Node releases
  • Line releases
  • Area approvals
  • node couplings


Keywords

RF-STAGES instability construction states calculation errors stiffness matrix singular error no. 10060 error no. 10134

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RF-STAGES 5.xx

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Consideration of construction stages during a building phase

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STAGES 8.xx

Add-on Module

Consideration of construction stages during a building phase

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