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Steel and Composite Structures Volume 48, Number 3, August 10 2023 , pages 251-262 DOI: https://doi.org/10.12989/scs.2023.48.3.251 |
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Slip-resistant bolted connections under freeze-thaw cycles and low temperature |
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A. Fuente-Garcia, M.A. Serrano-López, C. Lopez-Colina and F. Lopez-Gayarre
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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 freezethaw 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 °C 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. | ||
| Key Words | ||
| freeze-thaw cycles; low temperature; preloaded bolts; slip critical connections; surface treatment | ||
| Address | ||
| A. Fuente-Garcia, M.A. Serrano-López, C. Lopez-Colina and F. Lopez-Gayarre: EPS Engineering, Dep. Construction, University of Oviedo, Campus de Viesques, 33203 Gijon, Spain | ||