Seismic fragility and vulnerability assessment of multi-megawatt jacket-supported offshore wind turbines

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2025-06-20 DOI:10.1016/j.marstruc.2025.103882

Upasana Nath, Sumanta Haldar

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引用次数: 0

Abstract

Offshore wind turbines (OWTs) are increasingly installed in earthquake-prone regions, thus it is essential to determine the seismic risks associated with these structures. To ensure structural integrity of OWT, seismic fragility and vulnerability needs to be studied to evaluate structural performance and determine earthquake damage risk. This study investigates the seismic risk associated with the multi-megawatt OWTs supported by jacketed foundation. Three-dimensional numerical modelling of jacket, pile, and tower is developed in SAP2000 using non-linear beam elements. The soil-pile interaction is modelled by using American Petroleum Institute (API) based p-y springs. Different damage states were defined for various subsystems of tower, nacelle and substructure to develop the fragility curves of 5, 10, and 15 MW OWTs for near-field and far-field earthquake motions, considering ground motion directionality. The fragility of 15 MW OWTs are more sensitive in case of both near-field and far-field motions. Finally, the vulnerability models of the multi-megawatt OWTs are also developed to evaluate the expected loss of the structures.

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多兆瓦护套支撑海上风力涡轮机的地震易损性及易损性评估

海上风力涡轮机（OWTs）越来越多地安装在地震易发地区，因此确定与这些结构相关的地震风险至关重要。为了保证OWT结构的完整性，需要对OWT进行地震易损性和易损性研究，以评价OWT结构的性能，确定OWT结构的震害风险。本研究探讨了夹套基础支撑的多兆瓦水轮机的地震危险性。采用非线性梁单元，在SAP2000中开发了套、桩和塔的三维数值模拟。采用美国石油协会（API）的p-y弹簧模型对桩土相互作用进行了模拟。在考虑地震动方向性的情况下，对塔架、机舱和子结构的各个子系统定义了不同的损伤状态，绘制了5、10和15 MW owt在近场和远场地震作用下的易损性曲线。在近场和远场运动的情况下，15mw wot的脆弱性更为敏感。最后，建立了多兆瓦级水轮机的易损性模型，对结构的预期损失进行了评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.