Seismic performance assessment of monopile-supported offshore wind turbines using unscaled natural earthquake records
Seismic performance assessment of monopile-supported offshore wind turbines using unscaled natural earthquake records
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DOI：
10.1016/j.soildyn.2018.03.015
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发表时间：
2018-06-01
影响因子：
4
通讯作者：
Goda, Katsuichiro
中科院分区：
文献类型：
--
作者：
De Risi, Raffaele;Bhattacharya, Subhamoy;Goda, Katsuichiro
全球地震区的海上风力涡轮机发电场数量一直在增加。钢单桩支承风力涡轮机是可行的结构体系中最常用的结构体系，其抗震性能尚未得到深入研究，需要更多的研究来了解这些结构在极端地震事件中的潜在脆弱性，并制定更可靠的设计和评估程序。本文研究了典型海上风力机在强地震动作用下的结构性能评估。建立了海上风力机的有限元模型，并对其进行了非密封天然地震记录试验。首次通过基于云的地震易损性分析研究了地震对地震类型(地壳、板内和界面)的敏感性以及土壤变形性和模拟细节的影响。据观察，单桩支撑的海上风力发电机特别容易受到地壳和界面的极端地震的影响，当结构由软土支撑时，这种脆弱性会增加。此外，为了避免高估海上风力发电机组的抗震能力，通常需要进行精细的结构建模。
The number of offshore wind turbine farms in seismic regions has been increasing globally. The seismic performance of steel monopile-supported wind turbines, which are the most popular among viable structural systems, has not been investigated thoroughly and more studies are needed to understand the potential vulnerability of these structures during extreme seismic events and to develop more reliable design and assessment procedures. This study investigates the structural performance assessment of a typical offshore wind turbine subjected to strong ground motions. Finite element models of an offshore wind turbine are developed and subjected to unsealed natural seismic records. For the first time, the sensitivity to earthquake types (i.e. crustal, inslab, and interface) and the influence of soil deformability and modeling details are investigated through cloud-based seismic fragility analysis. It is observed that monopile-supported offshore wind turbines are particularly vulnerable to extreme crustal and interface earthquakes, and the vulnerability increases when the structure is supported by soft soils. Moreover, a refined structural modeling is generally necessary to avoid overestimation of the seismic capacity of offshore wind turbines.