Details
| Titel in Übersetzung | Mechanismen der Ermüdungsdegradation in axial belasteten Grout-Verbindungen unter Wasser |
|---|---|
| Originalsprache | Englisch |
| Aufsatznummer | 108576 |
| Seiten (von - bis) | 1-15 |
| Seitenumfang | 15 |
| Fachzeitschrift | International Journal of Fatigue |
| Jahrgang | 189 |
| Frühes Online-Datum | 21 Aug. 2024 |
| Publikationsstatus | Veröffentlicht - Dez. 2024 |
Abstract
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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in: International Journal of Fatigue, Jahrgang 189, 108576, 12.2024, S. 1-15.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanisms of fatigue degradation process in axially loaded grouted connections under submerged conditions
AU - Borgelt, Jakob Michael
AU - Possekel, Joshua
AU - Schaumann, Peter
AU - Ghafoori, Elyas
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/12
Y1 - 2024/12
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
KW - S-N Curve
KW - Fatigue Degradation Mechanism
KW - Structural Health Monitoring
UR - http://www.scopus.com/inward/record.url?scp=85202838034&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2024.108576
DO - 10.1016/j.ijfatigue.2024.108576
M3 - Article
VL - 189
SP - 1
EP - 15
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
M1 - 108576
ER -