Mechanisms of fatigue degradation process in axially loaded grouted connections under submerged conditions

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Titel in ÜbersetzungMechanismen der Ermüdungsdegradation in axial belasteten Grout-Verbindungen unter Wasser
OriginalspracheEnglisch
Aufsatznummer108576
Seiten (von - bis)1-15
Seitenumfang15
FachzeitschriftInternational Journal of Fatigue
Jahrgang189
Frühes Online-Datum21 Aug. 2024
PublikationsstatusElektronisch veröffentlicht (E-Pub) - 21 Aug. 2024

Abstract

Grouted connections in offshore support structures bond overlapping steel tubes using ultra-high strength grout. These connections, used in jacket structures,
face dynamic pulsating loads and submerged conditions. Current design guidelines offer simplified S-N curves that do not reflect realistic conditions for offshore wind turbines. This study introduces a new S-N curve for axially loaded grouted connections under submerged conditions, based on large-scale high-cycle fatigue experiments. It also analyses the degradation behaviour of cyclic axially loaded grouted connections to identify critical phase changes: stable, incremental, and progressive. The study examines the impact of different load levels on degradation, focusing on displacement between the pile and sleeve. Lower load levels result in longer stable and progressive phases. As load levels increase, the stable phase shortens and eventually disappears at the highest load levels. Damage within the grout material is categorised into crackdriven and crushing-driven patterns, with the latter linked to longer lifetimes. Even at the lowest load levels, minor damage occurs, precluding an endurance limit. This understanding of degradation mechanisms supports the assessment of grouted connections using monitoring systems.

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Mechanisms of fatigue degradation process in axially loaded grouted connections under submerged conditions. / Borgelt, Jakob Michael; Possekel, Joshua; Schaumann, Peter et al.
in: International Journal of Fatigue, Jahrgang 189, 108576, 12.2024, S. 1-15.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Borgelt JM, Possekel J, Schaumann P, Ghafoori E. Mechanisms of fatigue degradation process in axially loaded grouted connections under submerged conditions. International Journal of Fatigue. 2024 Dez;189:1-15. 108576. Epub 2024 Aug 21. doi: 10.1016/j.ijfatigue.2024.108576
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abstract = "Grouted connections in offshore support structures bond overlapping steel tubes using ultra-high strength grout. These connections, used in jacket structures, face dynamic pulsating loads and submerged conditions. Current design guidelines offer simplified S-N curves that do not reflect realistic conditions for offshore wind turbines. This study introduces a new S-N curve for axially loaded grouted connections under submerged conditions, based on large-scale high-cycle fatigue experiments. It also analyses the degradation behaviour of cyclic axially loaded grouted connections to identify critical phase changes: stable, incremental, and progressive. The study examines the impact of different load levels on degradation, focusing on displacement between the pile and sleeve. Lower load levels result in longer stable and progressive phases. As load levels increase, the stable phase shortens and eventually disappears at the highest load levels. Damage within the grout material is categorised into crackdriven and crushing-driven patterns, with the latter linked to longer lifetimes. Even at the lowest load levels, minor damage occurs, precluding an endurance limit. This understanding of degradation mechanisms supports the assessment of grouted connections using monitoring systems.",
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Download

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AU - Borgelt, Jakob Michael

AU - Possekel, Joshua

AU - Schaumann, Peter

AU - Ghafoori, Elyas

N1 - Publisher Copyright: © 2024 The Authors

PY - 2024/8/21

Y1 - 2024/8/21

N2 - Grouted connections in offshore support structures bond overlapping steel tubes using ultra-high strength grout. These connections, used in jacket structures, face dynamic pulsating loads and submerged conditions. Current design guidelines offer simplified S-N curves that do not reflect realistic conditions for offshore wind turbines. This study introduces a new S-N curve for axially loaded grouted connections under submerged conditions, based on large-scale high-cycle fatigue experiments. It also analyses the degradation behaviour of cyclic axially loaded grouted connections to identify critical phase changes: stable, incremental, and progressive. The study examines the impact of different load levels on degradation, focusing on displacement between the pile and sleeve. Lower load levels result in longer stable and progressive phases. As load levels increase, the stable phase shortens and eventually disappears at the highest load levels. Damage within the grout material is categorised into crackdriven and crushing-driven patterns, with the latter linked to longer lifetimes. Even at the lowest load levels, minor damage occurs, precluding an endurance limit. This understanding of degradation mechanisms supports the assessment of grouted connections using monitoring systems.

AB - Grouted connections in offshore support structures bond overlapping steel tubes using ultra-high strength grout. These connections, used in jacket structures, face dynamic pulsating loads and submerged conditions. Current design guidelines offer simplified S-N curves that do not reflect realistic conditions for offshore wind turbines. This study introduces a new S-N curve for axially loaded grouted connections under submerged conditions, based on large-scale high-cycle fatigue experiments. It also analyses the degradation behaviour of cyclic axially loaded grouted connections to identify critical phase changes: stable, incremental, and progressive. The study examines the impact of different load levels on degradation, focusing on displacement between the pile and sleeve. Lower load levels result in longer stable and progressive phases. As load levels increase, the stable phase shortens and eventually disappears at the highest load levels. Damage within the grout material is categorised into crackdriven and crushing-driven patterns, with the latter linked to longer lifetimes. Even at the lowest load levels, minor damage occurs, precluding an endurance limit. This understanding of degradation mechanisms supports the assessment of grouted connections using monitoring systems.

KW - Grouted Connections

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KW - Fatigue Degradation Mechanism

KW - Structural Health Monitoring

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