An experimental study on the parameters affecting the cyclic lateral response of monopiles for offshore wind turbines in sand

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OriginalspracheEnglisch
Seiten (von - bis)1570-1587
Seitenumfang18
FachzeitschriftSoils and foundations
Jahrgang60
Ausgabenummer6
Frühes Online-Datum5 Nov. 2020
PublikationsstatusVeröffentlicht - Dez. 2020

Abstract

The design of monopile foundations for offshore wind turbine structures is dominated by requirements resulting from serviceability and fatigue limit state. To fulfil these criteria, the load deflection-behaviour and therefore long-term accumulations of permanent deflections and rotations of the monopile foundation due to cyclic occurring wind and wave loads have to be predicted. In this paper a brief overview on current design code practice as well as other proposed methods for the prediction of accumulated deflections or rotations is given. Further, the results of a systematic model test study dealing with the response of monopiles to lateral cyclic loading in medium dense sand at different cyclic load ratios, load eccentricities and pile embedment lengths are described and evaluated. The observations of the model test study are supplemented by results of a second test series involving the visualisation of displacement fields around laterally loaded piles by means of particle image velocimetry. Based on the findings and the results of previous experimental investigations, recommendations regarding the prediction of displacement accumulations for large diameter monopiles in sand are given.

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An experimental study on the parameters affecting the cyclic lateral response of monopiles for offshore wind turbines in sand. / Frick, Dennis; Achmus, Martin.
in: Soils and foundations, Jahrgang 60, Nr. 6, 12.2020, S. 1570-1587.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Frick D, Achmus M. An experimental study on the parameters affecting the cyclic lateral response of monopiles for offshore wind turbines in sand. Soils and foundations. 2020 Dez;60(6):1570-1587. Epub 2020 Nov 5. doi: 10.1016/j.sandf.2020.10.004, 10.15488/10790
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abstract = "The design of monopile foundations for offshore wind turbine structures is dominated by requirements resulting from serviceability and fatigue limit state. To fulfil these criteria, the load deflection-behaviour and therefore long-term accumulations of permanent deflections and rotations of the monopile foundation due to cyclic occurring wind and wave loads have to be predicted. In this paper a brief overview on current design code practice as well as other proposed methods for the prediction of accumulated deflections or rotations is given. Further, the results of a systematic model test study dealing with the response of monopiles to lateral cyclic loading in medium dense sand at different cyclic load ratios, load eccentricities and pile embedment lengths are described and evaluated. The observations of the model test study are supplemented by results of a second test series involving the visualisation of displacement fields around laterally loaded piles by means of particle image velocimetry. Based on the findings and the results of previous experimental investigations, recommendations regarding the prediction of displacement accumulations for large diameter monopiles in sand are given.",
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AU - Achmus, Martin

N1 - Funding Information: This study was carried out in the scope of the research project “Accumulation of lateral displacements of piles under general cyclic one- and two-way loading” (project no. 393683178) funded by German Research Foundation (DFG). The authors sincerely acknowledge DFG support.

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N2 - The design of monopile foundations for offshore wind turbine structures is dominated by requirements resulting from serviceability and fatigue limit state. To fulfil these criteria, the load deflection-behaviour and therefore long-term accumulations of permanent deflections and rotations of the monopile foundation due to cyclic occurring wind and wave loads have to be predicted. In this paper a brief overview on current design code practice as well as other proposed methods for the prediction of accumulated deflections or rotations is given. Further, the results of a systematic model test study dealing with the response of monopiles to lateral cyclic loading in medium dense sand at different cyclic load ratios, load eccentricities and pile embedment lengths are described and evaluated. The observations of the model test study are supplemented by results of a second test series involving the visualisation of displacement fields around laterally loaded piles by means of particle image velocimetry. Based on the findings and the results of previous experimental investigations, recommendations regarding the prediction of displacement accumulations for large diameter monopiles in sand are given.

AB - The design of monopile foundations for offshore wind turbine structures is dominated by requirements resulting from serviceability and fatigue limit state. To fulfil these criteria, the load deflection-behaviour and therefore long-term accumulations of permanent deflections and rotations of the monopile foundation due to cyclic occurring wind and wave loads have to be predicted. In this paper a brief overview on current design code practice as well as other proposed methods for the prediction of accumulated deflections or rotations is given. Further, the results of a systematic model test study dealing with the response of monopiles to lateral cyclic loading in medium dense sand at different cyclic load ratios, load eccentricities and pile embedment lengths are described and evaluated. The observations of the model test study are supplemented by results of a second test series involving the visualisation of displacement fields around laterally loaded piles by means of particle image velocimetry. Based on the findings and the results of previous experimental investigations, recommendations regarding the prediction of displacement accumulations for large diameter monopiles in sand are given.

KW - 1g model tests

KW - Lateral cyclic loading

KW - Monopiles

KW - Offshore wind turbine foundations

KW - Particle image velocimetry

KW - Pile deflection accumulation

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