Christine Heistermann

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Archive | 2012

Milan Veljkovic; Christine Heistermann; Wylliam Husson; Marouene Limam; Markus Feldmann; Johannes Naumes; Daniel Pak; T. Faber; M. Klose; K-U Fruhner; L. Krutschinna; C. Baniotopoulos; I. Lavasas; Ana Claudine Pontes; Expedito E. Ribeiro; M. Hadden; Rog '{e}rio de Sousa; L. da Silva; Carlos Rebelo; Rui Simões; José Henriques; Rodrigo Antônio Torres Matos; J. Nuutinen; H. Kinnunen

Innovative solutions for assembling joints of a tubular tower for wind turbines were studied and the project provides a background for design. This solution is simpler to produce and 80 % less expe ...

Advanced Steel Construction | 2017

Christine Heistermann; Marko Pavlović; Milan Veljkovic; Daniel Pak; Markus Feldmann; Carlos Rebelo; Luís Simões da Silva

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.

Journal of Constructional Steel Research | 2013