Fragility analysis of offshore wind turbine expose to near-field pulse-like ground motion

Chaudhari, Vasudeo and Somala, Surendra Nadh (2021) Fragility analysis of offshore wind turbine expose to near-field pulse-like ground motion. Asian Journal of Civil Engineering, 22 (7). pp. 1331-1345. ISSN 1563-0854

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Abstract

The near field pulse-like ground motion has significant effects on a long-period structure like a wind turbine. Such pulses can be due to source effect (directivity) or site effect (presence of basins), to name a few. The presence of such pulses in the existing recordings of earthquakes is well documented. However, due to the paucity of such pulse-like recordings, simplified shapes have been proposed in literature in accordance with the observed features. In this study, the influence of characteristics parameters of earthquake velocity pulse on the monopile-supported offshore wind turbine (OWT) determined. The four parameters of velocity pulse, i.e., vp the velocity amplitude, fp the prevailing frequency, n number of pulse, and the α/β parameter of envelope function, are considered. To perform the incremental dynamic analysis, the numerical model of OWT is developed in open-source software OpenSees. The pulse-like ground motion parameters effects are shown in terms of fragility curves for the serviceability limit state and ultimate limit state. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

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