Seismic Fragility Analysis of Three-Legged Jacket Supported Offshore Wind Turbine Considering Ground Motion Directionality

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4. Seismic Fragility Analysis of Three-Legged Jacket Supported Offshore Wind Turbine Considering Ground Motion Directionality

ABSTRACT:  Because of growing awareness of the limited availability of fossil fuel resources, the global energy production paradigm has shifted in recent years to the generation of sustainable renewable energy sources, such as wind power. The growing demand for OWTs necessitates their deployment in seismically active regions in deep waters. This highlights the importance of investigating the seismic vulnerability of OWT structures when subjected to seismic loads. The current study examined the seismic fragility of 10 MW wind turbines supported by a three-legged jacketed structure, taking into account the ground motion directionality. A three-dimensional numerical model of three-legged jacket supported OWTs is developed in SAP2000. This study incorporates five near-field and five far-field earthquake motions to analyse the seismic vulnerability of the wind turbine structures. Incremental dynamic analysis (IDA) was used to develop the fragility curves at various angles of ground motion incidence for the considered responses of the structure. Finally, the findings of the study provide useful insight into evaluating the seismic performance of OWTs in order to ensure structural safety and reliability.

Keywords:  3-legged jacket; Ground motion directionality; Incremental dynamic analysis; Seismic fragility

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

10 - Jacket pin piles design: capacity, long-term cyclic loading, seismic loads