Mindestverdübelung von Verbundträgern im Brandfall

Samuel Pfenning, Sven Brunkhorst, Martin Mensinger, Jochen Zehfuß

Research output: Contribution to specialist publicationArticle

3 Scopus citations

Abstract

Minimum degree of shear connection of composite beams in fire. In the scope of the research project „Mindestverdübelung von Verbundträgern bei Brand” (Minimum degree of shear connection of composite beams in fire) numerical and experimental investigations were conducted to derive design rules and limitations for the use for the partial connection theory in fire. In this paper, the conducted investigations as well as the most important influences of the elevated temperatures on the composite beam and especially on the composite joint are presented. The slip in the composite joint and its reasons are discussed for a single span beam in a fire situation. It is shown that with the use of a minimum degree of shear connection for the limitation of the maximum slip of the composite joint, there is no influence of the degree of shear connection on the load carrying capacity of a composite beam in case of fire. Due to the quickly rising temperatures of a composite beam in fire, the resistance of the composite joint quickly exceeds the tensile resistance of the steel section. The derived design rules for a safe use of the partial connection theory in fire situations based on the degree of shear connection as well as on the relation between the concrete tensile capacity and the shear capacity of the composite joint are presented.

Original languageEnglish
Pages234-246
Number of pages13
Volume88
No3
Specialist publicationStahlbau
DOIs
StatePublished - Mar 2019
Externally publishedYes

Keywords

  • FE model
  • analysis and calculation
  • composite construction
  • composite construction
  • degree of shear connection
  • fire protection
  • large-scale fire test
  • minimum degree of shear connection

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