On analysis and redesign of bolted L-flanged connections

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    Abstract

    In wind turbine towers, the preferred design is circular tubes that are connected by a bolted flange joint. The design is typically that of an L-flange resulting in an eccentrically loaded bolted connection. The eccentricity results in a non-linear relationship between external load on the tower and the tensile force in the bolt. In the literature and also in standards,different models are presented for this important non-linear response. In the present paper, a simplified expression for the non-linear force response is presented based on finite element calculations using contact analysis. The L-flange connection is in essence a bad design because it leads to a non-optimal ratio between external force and bolt force. Furthermore,bolt bending results in an even higher bolt stress resulting in a reduction of strength. The present paper presents simple modifications of the L-flange design that considerably improves the connection strength.
    Original languageEnglish
    JournalWind Energy
    Volume20
    Issue number6
    Pages (from-to)1069-1082
    ISSN1095-4244
    DOIs
    Publication statusPublished - 2017

    Keywords

    • L-flange
    • Bolt
    • Eccentric
    • Contact
    • Design
    • FE

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