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Shake table testing and computational framework for seismic response of utility-scale bucket foundation offshore wind turbines.

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Title: Shake table testing and computational framework for seismic response of utility-scale bucket foundation offshore wind turbines.
Authors: Zayed, Muhammad1,2 (AUTHOR) muhammad.zayed@eng.asu.edu.eg, Kim, Kyungtae3 (AUTHOR) kyungtae.kim@dot.ca.gov, Prabhakaran, Athul4 (AUTHOR) aparayan@eng.ucsd.edu, Elgamal, Ahmed1,4 (AUTHOR) elgamal@ucsd.edu
Source: Soil Dynamics & Earthquake Engineering (0267-7261). Aug2023, Vol. 171, pN.PAG-N.PAG. 1p.
Subjects: Shaking table tests, Wind turbines, Offshore structures, Soil-structure interaction, Seismic response, Wind pressure, Pails, Soil dynamics
Abstract: Shake table testing was conducted to document the seismic response of a bucket foundation offshore wind turbine (OWT) system. Salient response of the system's soil-structure interaction effects is presented and discussed. Among the observed response characteristics, excess pore pressure fluctuation within and around the soil-bucket domain is thoroughly addressed, including the strong tendency for the soil dilation excursions driven by the induced cyclic strains. The experimental data is used to calibrate a numerical model with dynamic soil response simulated by a coupled solid-fluid formulation. The calibrated model is extended to investigate seismic response of a prototype utility-scale OWT, with and without added wind loading effects. Overall, the research outcomes indicate that: i) excess pore pressure fluctuations in the vicinity of the bucket play an important role in dictating the extent of potential permanent base rotation, ii) consideration should be given to wind loading that might further exacerbate this base rotation, and iii) it is of importance to model the turbine tower as a system of discrete masses rather than the simplified proposed for practice equivalent top mass idealization. • Shake table testing was conducted to document seismic response of bucket foundation offshore wind turbine (OWT) system. • The experimental data is used to calibrate a numerical model. • The calibrated model is extended to investigate seismic response of a prototype utility-scale OWT. • Excess pore pressure changes in the vicinity of the bucket play an important role in dictating the permanent base rotation. • Modeling the OWT as a system of discrete masses rather than the simplified single equivalent mass idealization is crucial. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Shake table testing was conducted to document the seismic response of a bucket foundation offshore wind turbine (OWT) system. Salient response of the system's soil-structure interaction effects is presented and discussed. Among the observed response characteristics, excess pore pressure fluctuation within and around the soil-bucket domain is thoroughly addressed, including the strong tendency for the soil dilation excursions driven by the induced cyclic strains. The experimental data is used to calibrate a numerical model with dynamic soil response simulated by a coupled solid-fluid formulation. The calibrated model is extended to investigate seismic response of a prototype utility-scale OWT, with and without added wind loading effects. Overall, the research outcomes indicate that: i) excess pore pressure fluctuations in the vicinity of the bucket play an important role in dictating the extent of potential permanent base rotation, ii) consideration should be given to wind loading that might further exacerbate this base rotation, and iii) it is of importance to model the turbine tower as a system of discrete masses rather than the simplified proposed for practice equivalent top mass idealization. • Shake table testing was conducted to document seismic response of bucket foundation offshore wind turbine (OWT) system. • The experimental data is used to calibrate a numerical model. • The calibrated model is extended to investigate seismic response of a prototype utility-scale OWT. • Excess pore pressure changes in the vicinity of the bucket play an important role in dictating the permanent base rotation. • Modeling the OWT as a system of discrete masses rather than the simplified single equivalent mass idealization is crucial. [ABSTRACT FROM AUTHOR]
ISSN:02677261
DOI:10.1016/j.soildyn.2023.107939