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Connections in towers for wind converters: part I: Evaluation of down-scaled experiments
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.ORCID iD: 0000-0003-4791-2341
Institut für Stahlbau, Institute for Steel Construction, RWTH Aachen, University.
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2015 (English)In: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 115, p. 445-457Article in journal (Refereed) Published
Abstract [en]

The cost of a tubular steel tower supporting a wind converter becomes increasingly important in a competitive energy market. In-situ connection between tower segments is an important factor of the design. The tower segments are usually connected by welded ring flanges. An alternative solution based on a novel single lap friction connection is analysed. The purpose of the research presented in this paper is to thoroughly analyse the behaviour of both connections by an experimental testing programme and advanced finite element analysis (FEA). Down-scaled experiments of ring flange and friction connection in circular towers were performed using a 4-point bending test set-up. Altogether eight connections joining cylindrical shell, 1 m diameter, plate thickness 8 mm and total span of about 7 m were tested. A friction connection with long open slotted holes and two different cases of the ring flange connection are considered: with perfectly flat flanges and flanges with geometric imperfection. Results of advanced quasi-static FEA, using explicit dynamic solver and ductile damage material model for bolts, are compared to experiments. Failure modes, bolt forces and distribution of meridional membrane stresses in the shell in the vicinity of connections are analysed. Existing hand-calculation models, for the bolt force and normal stress distribution in the shell are validated by experiments and FEA.

Place, publisher, year, edition, pages
2015. Vol. 115, p. 445-457
National Category
Building Technologies
Research subject
Steel Structures; Centre - Centre for High Performance Steel (CHS)
Identifiers
URN: urn:nbn:se:ltu:diva-2614DOI: 10.1016/j.jcsr.2015.09.002ISI: 000364617800035Scopus ID: 2-s2.0-84944159014Local ID: 04086828-6636-41e8-9ce9-6e0443483b5fOAI: oai:DiVA.org:ltu-2614DiVA, id: diva2:975467
Note

Validerad; 2015; Nivå 2; 20151001 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-03-29Bibliographically approved

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Pavlovic, MarkoHeistermann, ChristineVeljkovic, Milan

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