FAQ 002505 EN-US

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I have designed a steel connection using RF‑JOINTS and then created a model to compare it in RFEM. Why are the results not identical?

Answer

In RF-/JOINTS, an idealized design of a steel connection according to the standard is performed, which cannot be easily compared with an exact FE calculation. The results of the numerical and analytical design method differ in particular due to the simplifications and assumptions made.

For example, the following points must be considered when calculating a connection as a surface model:

  • Consideration or exclusion of friction/compression/tension within the contact solid (tab "Solid") as well as for the bolts modeled subsequently
  • Consideration of internal forces and deformations within post-modeled end plates or similar, which results in a redistribution of bolt forces in the FE calculation (in contrast to the idealized design in RF-/JOINTS)
  • Uniform load introduction into the FE model, for example, by using rigid members or rigid surfaces as described in the article "FEM Modeling Approaches of Rigid Connections"

You can find some webinars and technical articles on this topic on our website (see links below).

Keywords

Joint Results Surface model

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  • Updated 11/26/2020

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RSTAB Connections
JOINTS Steel - Rigid 8.xx

Add-on Module

RSTAB add-on module - Design of restraint joints according to EN 1993-1-8

Price of First License
1,030.00 USD
RSTAB Connections
JOINTS Steel - Pinned 8.xx

Add-on Module

Design of pinned joints according to Eurocode 3

Price of First License
670.00 USD
RSTAB Connections
JOINTS Steel - DSTV 8.xx

Add-on Module

Design of standardised joints in steel structures according to the EN 1993‑1‑8 - DSTV guideline

Price of First License
670.00 USD
RFEM Connections
RF-JOINTS Steel - Rigid 5.xx

Add-on Module

Design of rigid connections according to Eurocode 3

Price of First License
1,030.00 USD
RFEM Connections
RF-JOINTS Steel - DSTV 5.xx

Add-on Module

Design of standardised joints in steel structures according to the EN 1993‑1‑8 - DSTV guideline

Price of First License
670.00 USD
RFEM Connections
RF-JOINTS Steel - Pinned 5.xx

Add-on Module

Design of pinned connections according to Eurocode 3

Price of First License
670.00 USD