Analysis of Monopile Foundation on Offshore Wind Turbine Structure

Abstract:

Central Java is one of the provinces in Indonesia having the largest potential for wind energy consumption with a potential of 8.56 Gigawatts. The development of wind energy through the construction of Offshore Wind Turbines (OWT) can supply the demand for power consumption in Central Java. The monopile is the most adopted foundation concept for the sea depths of less than 40m. This study aims to design an optimum monopile foundation to support the wind turbine structure and to evaluate the stability of the foundation based on a combination of extreme wind and extreme wave conditions. The design is based on the criteria of deflection and rotation requirements. The analysis was conducted in consideration of variations in the diameter, thickness and embedded length of the monopile. The soil layers in the studied area consist of very soft clay to very stiff clay. Monopile foundation is designed based on design criteria according to limit state design, namely ultimate limit state (ULS), Serviceability Limit State (SLS) and Fatigue Limit State (FLS). It was obtained the diameter, thickness, and embedded length of the monopile about 3.25m, 0.042m, and 52.8m. The embedded length and diameter have significant contribution to the bearing capacity and reduce the magnitude of deflection and rotation monopile.

• Periodical: Construction Technologies and Architecture (Volume 18)
• Pages: 59-74
• DOI: https://doi.org/10.4028/p-deO8yE
• Online since: June 2025
• Authors: M. Rahmadi Aditya, Khairullah Yusuf*, Chandra Yovi, Gendam Prakoso Wahyu, Maizuar Maizuar
• Keywords: Limit State Design, Monopile, Offshore Wind Turbine, Renewable Energy, Wind Energy

References

[1] Badan Pusat Statistik Jawa Tengah, Provinsi Jawa Tengah dalam Angka, vol. 49. Jawa Tengah: Badan Pusat Statistik Jawa Tengah, 2024.

DOI: 10.31002/rep.v5i2.1919

[2] Sekretariat Jenderal Dewan Energi, Outlook Energi Indonesia. 2023.

[3] D. Kallehave, B. W. Byrne, C. LeBlanc Thilsted, and K. K. Mikkelsen, "Optimization of monopiles for offshore wind turbines," Phil. Trans. R. Soc. A., vol. 373, no. 2035, p.20140100, Feb. 2015.

DOI: 10.1098/rsta.2014.0100

[4] C. Menéndez-Vicente, S. López-Querol, S. Bhattacharya, and R. Simons, "Numerical study on the effects of scour on monopile foundations for Offshore Wind Turbines: The case of Robin Rigg wind farm," Soil Dynamics and Earthquake Engineering, vol. 167, p.107803, Apr. 2023.

DOI: 10.1016/j.soildyn.2023.107803

[5] N. M. Nasab, J. Kilby, and L. Bakhtiaryfard, "Analysis and Design of Monopile Foundations for Offshore Wind and Tidal Turbine Structures," Water, vol. 14, no. 21, p.3555, Nov. 2022.

DOI: 10.3390/w14213555

[6] L. Arany, S. Bhattacharya, J. Macdonald, and S. J. Hogan, "Design of monopiles for offshore wind turbines in 10 steps," Soil Dynamics and Earthquake Engineering, vol. 92, p.126–152, Jan. 2017.

DOI: 10.1016/j.soildyn.2016.09.024

[7] Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), "Ocean Forecast System (OFS)." 2023.

DOI: 10.29408/geodika.v4i1.1915

[8] Energieschweiz, "Kalkulator Weibull." Accessed: Jun. 10, 2024. [Online]. Available: https://wind-data.ch/tools/weibull.php

[9] R. Gupta and A. Biswas, "Wind data analysis of Silchar (Assam, India) by Rayleigh's and Weibull methods," 2010.

[10] T. R. Ayodele, A. A. Jimoh, J. L. Munda, and J. T. Agee, "Statistical analysis of wind speed and wind power potential of Port Elizabeth using Weibull parameters," J. energy South. Afr., vol. 23, no. 2, p.30–38, May 2012.

DOI: 10.17159/2413-3051/2012/v23i2a3160

[11] S. Bhattacharya, Design of Foundations for Offshore Wind Turbines, 1st ed. Wiley, 2019.

[12] IEC 61400-1. in Third edition. 2005.

[13] Y.-S. Kuo, M. Achmus, and K. A. Rahman, "Minimum Embedded Length of Cyclic Horizontally Loaded Monopiles," Journal of Geotechnical and Geoenvironmental Engineering, vol. 138, no. 3, 2011.

DOI: 10.1061/(asce)gt.1943-5606.0000602

[14] S. Bhattacharya, G. Nikitas, L. Arany, and N. Nikitas, "Soil-Structure Interactions (SSI) for Offshore Wind Turbines," Agustus 2017.

DOI: 10.1049/etr.2016.0019

[15] P. Kucharczyk, A. Rizos, S. Münstermann, and W. Bleck, "Estimation of the endurance fatigue limit for structural steel in load increasing tests at low temperature.," Fatigue Fract Eng Mater Struct, 2012.

DOI: 10.1111/j.1460-2695.2011.01656.x

[16] R. Obrzud and A. Truty, The Hardening Soil Model A Practical Guidebook. Switzerland: ZSoil, 2020.

[17] T. Adayat, "Determination of the Undrained Shear Strength of Sensitive Clay Using Some Laboratory Soil Data," Redfame Publishing, vol. 8, 2021.

[18] S. K. Thota, T. D. Cao, and F. Vahedifard, "Poisson's Ratio Characteristic Curve of Unsaturated Soils," Journal of Geotechnical and Geoenvironmental Engineering, 2020.

DOI: 10.1061/(asce)gt.1943-5606.0002810

[19] IEC 61400-1, Wind Energy Generation System - Part 1 : Design Requirement, Geneva, Switzerland., 2019.

[20] M. T. Davisson and S. Prakash, "A Review of Soil-Pole Behavior," Committ ee on Stress Distributi on in Earth Masses, 1963.

[21] M. H. Patel, Dynamics of Offshore Structure. Butterworth & Co., 1989.

[22] API, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design. Washington DC: American Petroleum Institute, 2007.

DOI: 10.2523/20837-ms

[23] Det Norske Veritas, Fatigue Design of Offshore Steel Structures, 2011.