Steel and Composite Structures

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Slip-resistant bolted connections under freeze-thaw cycles and low temperature

  • A. Fuente-Garcia (EPS Engineering, Dep. Construction, University of Oviedo, Campus de Viesques) ;
  • M.A. Serrano-Lopez (EPS Engineering, Dep. Construction, University of Oviedo, Campus de Viesques) ;
  • C. Lopez-Colina (EPS Engineering, Dep. Construction, University of Oviedo, Campus de Viesques) ;
  • F., Lopez-Gayarre (EPS Engineering, Dep. Construction, University of Oviedo, Campus de Viesques)
  • Received : 2022.07.21
  • Accepted : 2023.07.26
  • Published : 2023.08.10
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Abstract

There are many examples of steel structures subjected to severe environmental conditions with bolted connections directly exposed to extreme climatic agents such as freeze-thaw cycles or low temperatures. Some examples are: steel bridges, mining transfer towers, wind towers... These service conditions neither are included in Eurocode 3 or EN1090-2, nor there are references in other international standards. In this experimental research, 46 specimens of non-slip joints with HV M20 bolts and four different types of contact surfaces have been studied. Half of the specimens were subjected to fourteen twelve-hours freeze-thaw cycles, with periodic immersion in water and temperature oscillation. Subsequently, half of the connections were subjected to a slip test under monotonic load at temperature of -20 ± 0.5 ℃ and the other half at room temperature. The results were compared with others equal joints not subjected to freeze-thaw cycles and kept at room temperature for the same time. This finally resulted in 4 sets of joints by combining the freeze-thaw degradation or not with the low-temperature conditions or not in the slip testing. Therefore, a total of 16 different conditions were studied by also considering 4 different contact surfaces between the joined plates in each set. The results obtained show influence of environmental conditions on the slip resistant capacity of these joints.

Keywords

Acknowledgement

The research described in this paper was supported by the research group IEMES of University of Oviedo. The authors would like to thank the Concrete Technology Laboratory for their support. The authors also wish to thank the Reviewers for their valuable and constructive comments.

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