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

RF-JOINTS performs an idealized design of a steel connection according to the standard, which cannot be easily compared with an exact FE calculation.

Thus, the following conditions must be met:

  • Consideration or exclusion of friction/compression/tension within the contact solid (tab 'Solid') as well as for the bolts modelled subsequently
  • Consideration of internal forces and deformations within the subsequently modelled end plates or similar, which causes redistribution of bolt forces in the FE calculation (in contrast to the idealized design in RF‑JOINTS)
    This can be corrected by rigid connection objects, for example (an end plate as a rigid surface). 
  • 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'

Keywords

connection joint RF-JOINTS results

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