1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
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Τύπος:	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Seismic analysis of a model tension leg supported wind turbine under seabed liquefaction
Συγγραφέας:	[EL] Χαλούλος, Ιωάννης[EN] Chaloulos, Yannis [EL] Τσιάπας, Ιωάννης[EN] Tsiapas, Ioannis [EL] Μπουκοβάλας, Γεώργιος[EN] Bouckovalas, George
Ημερομηνία:	15/08/2021
Περίληψη:	The paper presents numerical analyses of a pile supported Tension Leg Platform (TLP) wind turbine, during seismic loading and seabed liquefaction, taking consistently into account the pile-tendon-platform interaction. The emphasis is on the system response when subsoil liquefaction is extensive, leading to degradation of the pseudo-static safety factor against pile pullout well below unity. It is shown that the pile resistance to pullout failure decreases drastically during shaking, but fully recovers during the following dissipation of earthquakeinduced excess pore pressures and even exceeds the initial (pre-shaking) resistance. Pile head displacements develop steadily both during shaking and dissipation, but only while the static pullout safety factor remains less than unity. Due to the high tensional stiffness of the tendons relative to the buoyancy stiffness of the platform considered in this study, the pile head pullout is mostly transmitted to the platform with a relatively small part corresponding to reduction of tendon elongation. The resulting loss of buoy stability and tendon pretension may prove detrimental for the short-term operation of the platform. However, except possibly from the rare scenario of concurrent extreme environmental loads, both effects are recoverable, as they are unlikely to cause irreparable damage to the foundation and the superstructure.
Γλώσσα:	Αγγλικά
Σελίδες:	11
DOI:	10.1016/j.oceaneng.2021.109706
EISSN:	1873-5258
Θεματική κατηγορία:	[EL] Πολιτική μηχανική[EN] Civil Engineering
Λέξεις-κλειδιά:	Tension leg platform; Wind turbine; Offshore piles; Liquefaction; 3D numerical analysis; Seismic loading
Κάτοχος πνευματικών δικαιωμάτων:	© 2021 Elsevier Ltd.
Όροι και προϋποθέσεις δικαιωμάτων:	All rights reserved
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://www.sciencedirect.com/science/article/pii/S0029801821010775
Ηλεκτρονική διεύθυνση περιοδικού:	https://www.sciencedirect.com/journal/ocean-engineering
Τίτλος πηγής δημοσίευσης:	Ocean Engineering
Τόμος:	238
Σελίδες τεκμηρίου (στην πηγή):	Article no 109706
Σημειώσεις:	This research is carried out/funded in the context of the project “Seismic design of offshore wind turbines: Effect of pile foundation damping and soil liquefaction” (MIS 5049428) under the call for proposals “Researchers’ support with an emphasis on young researchers2nd Cycle”. The project is co-financed by Greece and the European Union (European Social Fund- ESF) by the Operational Programme Human Resources Development, Education and Lifelong Learning 2014–2020.
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