Influence of execution tolerances for friction connections in circular and polygonal towers for wind converters

Christine Heistermann, Marko Pavlović, Milan Veljković, Daniel Pak, Markus Feldmann, Carlos Rebelo, Luis Simões da Silva

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

Friction connections with long open slotted holes have been proven to be a competitive alternative to the conventional flange connections in steel tubular towers for wind energy converters. As full-scale tests are not available, results of Finite Element Analysis (FEA) of the real-scale tower geometry are used in this paper to investigate the influence of tower cross section shape, execution tolerance (gap between the shells) and length of the connection on the bending resistance. Buckling behaviour of the shell in the vicinity of the friction connection in circular and polygonal towers is compared. The friction connection is thoroughly examined and recommendations for execution tolerances are given. The influence of two types of the execution tolerances on the connection strength is considered: inward bended “fingers”, leading to inclined gaps, and a parallel gap created by different tower diameters.

Original languageEnglish
Pages (from-to)343-360
Number of pages18
JournalAdvanced Steel Construction
Volume13
Issue number4
DOIs
Publication statusPublished - 2017

Keywords

  • Circular cross section
  • Execution tolerance
  • FEA
  • Friction connection
  • Long open slotted hole
  • Polygonal cross section
  • Steel tubular tower
  • Wind energy converter

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