A comparative experimental study on blind‐bolted beam connections to square steel tubular columns filled with polyurethane foam or concrete

Konstantinos Skalomenos*, Sahin Gunes, Farzad Taleb, Marios Theofanous

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

In the last two decades blind‐bolted connections have been developed to allow bolting of open section beams (e.g, I‐beam) to steel hollow section (SHS) columns where access from all sides of the column is not possible. Filling the tubular column with concrete in the vicinity of the beam‐to‐column connection has been shown to improve the anchoring mechanism of the blind‐bolted connection thereby increasing the strength and stiffness of the connection and reducing the column face deformation, however it adversely affects the joint ductility. This study introduces polyurethane foam filled steel tubular columns in combination with a new anchoring arrangement employing hollo‐bolts to develop a novel connection between the SHS columns and open section beams that provides a better combination of stiffness, strength and ductility. To investigate the behaviour of the proposed arrangement, monotonic pull‐out tests of blind bolted T‐stub connections anchored to foam‐filled steel tubular (FFT) and concrete‐filled steel tubular (CFT) columns using holloBolts were conducted. Benchmark tests on unfilled SHS columns were also conducted for comparison. The FFT in conjunction with the proposed anchoring mechanism was shown to provide a good stiffness as the CFT columns, and almost similar ductility to that of the unfilled steel tube blind‐bolted connection. Hence it is concluded that employing foam instead of concrete as an infill leads to favourable combination of strength and ductility, thus rendering FFT an attractive light alternative to CFT sections when ductility of the joint is an important design consideration.
Original languageEnglish
Pages (from-to)1332-1337
Number of pages6
Journalce/papers
Volume6
Issue number3-4
DOIs
Publication statusPublished - 12 Sept 2023

Keywords

  • Hollow section face bending
  • Concrete‐filled steel tubes (CFT)
  • Pull‐out tests
  • Blind bolted connections
  • Foam‐filled steel tubes (FFT)

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