PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2024) 000 – 000 Structural Integrity Procedia 00 (2024) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 484–491

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Structural monitoring, FEM updating and performance assessment of a wind turbine Serdar Soyoz a* , Serap Hanbay a , Burak Bagirgan a SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Structural monitoring, FEM updating and performance assessment of a wind turbine Serdar Soyoz a* , Serap Hanbay a , Burak Bagirgan a Abstract In this study, long-term monitoring of a 900-kW onshore wind turbine with a tubular steel tower of 54 meters high and foundation with 26 reinforced concrete piles was performed based on vibration data. Modal properties such as frequency, mode shape and damping ratios were obtained by Enhanced Frequency Domain Decomposition method. Then, change in modal parameters due to environmental and operational conditions was determined. Modal parameters after cleansing such effects were obtained by multiple linear regression analyses. Finite element model of the wind turbine was developed in ANSYS including piles. Soil-structure interaction was modelled by p y, t-z and q-z soil springs. Finite element model of the wind turbine was updated based on identified modal parameters. Finally, nonlinear time histories were performed to obtain seismic fragility curves of the structure with limit states being the local buckling under different levels of wind speed. In the context of this study, it was observed that identified modal values had significant scattering and level of wind speed significantly changed the seismic fragility curve of the wind turbine. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Wind turbine; Vibration-based monitoring; Environmental conditions; Operational effects; Performance assessment. 1. Introduction Wind energy is a type of widespread renewable energy all around the world. Therefore, structural health monitoring and seismic performance assessment of wind turbines have become a vital issue due to safety and economic concerns. © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers a Department of Civil Engineering, Bogazici University, Istanbul, 34342, Turkey a Department of Civil Engineering, Bogazici University, Istanbul, 34342, Turkey Abstract In this study, long-term monitoring of a 900-kW onshore wind turbine with a tubular steel tower of 54 meters high and foundation with 26 reinforced concrete piles was performed based on vibration data. Modal properties such as frequency, mode shape and damping ratios were obtained by Enhanced Frequency Domain Decomposition method. Then, change in modal parameters due to environmental and operational conditions was determined. Modal parameters after cleansing such effects were obtained by multiple linear regression analyses. Finite element model of the wind turbine was developed in ANSYS including piles. Soil-structure interaction was modelled by p y, t-z and q-z soil springs. Finite element model of the wind turbine was updated based on identified modal parameters. Finally, nonlinear time histories were performed to obtain seismic fragility curves of the structure with limit states being the local buckling under different levels of wind speed. In the context of this study, it was observed that identified modal values had significant scattering and level of wind speed significantly changed the seismic fragility curve of the wind turbine. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Wind turbine; Vibration-based monitoring; Environmental conditions; Operational effects; Performance assessment. 1. Introduction Wind energy is a type of widespread renewable energy all around the world. Therefore, structural health monitoring and seismic performance assessment of wind turbines have become a vital issue due to safety and economic concerns.

* Corresponding author. Tel.: +90 212 359 7788 E-mail address: serdar.soyoz@bogazici.edu.tr * Corresponding author. Tel.: +90 212 359 7788 E-mail address: serdar.soyoz@bogazici.edu.tr

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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