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IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints


IASS Symposium 2014

SESSION: General 2: Structural Analysis and Design

Nonlinear numerical simulation of bolted ring flanges in wind turbine towers

< Table of Contents for General 2: Structural Analysis and Design
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: General 2: Structural Analysis and Design
  • Title: Nonlinear numerical simulation of bolted ring flanges in wind turbine towers
  • Author(s): Ilias D. THANASOULAS, Konstantina G. KOULATSOU, Charis J. GANTES
  • Keywords: Wind Turbine Towers, Bolted Ring Flanges, Contact, Nonlinearity, Finite Element Modeling
Abstract
The efficiency against fatigue of connections between adjacent parts of tubular wind turbine towers is investigated, taking realistically into account the dynamic nature of applied wind loads. Such connections are realized by means of double ring flanges that are pre-welded on the adjacent shell parts and are bolted together with fully preloaded bolts. In order to achieve that goal, two numerical models are created with the finite element program ADINA. The first is a detailed model of a single bolt using solid elements for bolt and flanges, while in the second the entire bolted ring flange connection is modeled employing shell elements for the flanges and beam elements for the bolts. Contact elements are appropriately used in both models to introduce the connection’s nonlinear behavior due to the interaction between flanges and bolts and between nuts and flanges. Nonlinear dynamic analysis results from the second model are used for fatigue checks according to Eurocode 3. The imposed wind load results from artificial wind pressure time histories obtained via an appropriate aerodynamic approach and producing wind forces acting on the wind turbine blades and transmitted to the hub.

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