EXPERIMENTAL STUDY ON RESPONSE CHARACTERISTICS OF TRIPOD BUCKET JACKET FOUNDATION UNDER CYCLIC LOAD FOR OFFSHORE WIND TURBINE

Zhu Ronghua; Zhao Shulong; Zhang Rongsheng; Liu Hanqiu; Lai Zongyuan; Pan Yufei

doi:10.19912/j.0254-0096.tynxb.2024-1228

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 667-675. DOI: 10.19912/j.0254-0096.tynxb.2024-1228

EXPERIMENTAL STUDY ON RESPONSE CHARACTERISTICS OF TRIPOD BUCKET JACKET FOUNDATION UNDER CYCLIC LOAD FOR OFFSHORE WIND TURBINE

Zhu Ronghua^1,2, Zhao Shulong¹, Zhang Rongsheng¹, Liu Hanqiu¹, Lai Zongyuan¹, Pan Yufei¹

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Abstract

Physical model tests were conducted in sandy soil to study the response characteristics of tripod bucket jacket foundations under cyclic loading. The cyclic rotation angle response, natural frequency, and damping ratio of the structure were analyzed. Based on the test results, an empirical prediction formula for the cumulative rotation angle of the foundation was proposed. The results indicate that an increase in cyclic load amplitude accelerates the accumulation rate of the foundation’s rotation angle. In a log-log coordinate system, the cumulative rotation angle of the foundation and the number of load cycles approximately exhibit a linear relationship. The natural frequency of the structure demonstrates a similar pattern of change under different cyclic load amplitudes： initially, there is a slight increase in the natural frequency, followed by a sharp decrease, and it then fluctuates around a certain average value as cyclic loading continues. The system's damping ratio sharply decreases at the beginning of loading, reducing to about 20% of the initial value, and then undergoes significant oscillations, with a variation of up to 80%.

Key words

offshore wind power / tripod bucket jacket foundation / cyclic loading / physical model test

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Zhu Ronghua, Zhao Shulong, Zhang Rongsheng, Liu Hanqiu, Lai Zongyuan, Pan Yufei. EXPERIMENTAL STUDY ON RESPONSE CHARACTERISTICS OF TRIPOD BUCKET JACKET FOUNDATION UNDER CYCLIC LOAD FOR OFFSHORE WIND TURBINE[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 667-675 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1228

References

[1] LEBLANC C, HOULSBY G T, BYRNE B W.Response of stiff piles in sand to long-term cyclic lateral loading[J]. Géotechnique, 2010, 60(2): 79-90.
[2] WANG L Z, ZHOU W J, GUO Z, et al.Frequency change and accumulated inclination of offshore wind turbine jacket structure with piles in sand under cyclic loadings[J]. Ocean engineering, 2020, 217: 108045.
[3] KONG D Q, WEN K, ZHU B, et al.Centrifuge modeling of cyclic lateral behaviors of a tetrapod piled jacket foundation for offshore wind turbines in sand[J]. Journal of geotechnical and geoenvironmental engineering, 2019, 145(11): 04019099.
[4] 余璐庆. 海上风机桶形基础安装与支撑结构动力特性研究[D]. 杭州: 浙江大学, 2014.
YU L Q.Study on dynamic characteristics of bucket foundation installation and supporting structure of offshore fan[D]. Hangzhou: Zhejiang University, 2014.
[5] 罗仑博, 王媛, 黄景琦, 等. 海洋循环荷载对吸力桶基础水平承载力的影响研究[J]. 太阳能学报, 2021, 42(3): 142-147.
LUO L B, WANG Y, HUANG J Q, et al.Study on effects of cyclic loading on lateral capacity of suction bucket foundations[J]. Acta energiae solaris sinica, 2021, 42(3): 142-147.
[6] ZHOU W J, GUO Z, WANG L Z, et al.Numerical model for suction caisson under axial cyclic loadings[J]. Ocean engineering, 2021, 240: 109956.
[7] 汪明元,李娜,程星磊,等. 软黏土中张紧式吸力桶基础循环弱化过程分析[J]. 太阳能学报,2023, 44(11):341-349.
WANG M Y, LI N, CHENG X L, et al.Analysis of cyclic degradation process of tensioned suction bucket foundations in soft clays[J]. Acta energiae solaris sinica, 2023, 44(11): 341-349.
[8] JEONG Y H, LEE S W, KIM J H.Centrifuge modeling for the evaluation of the cyclic behavior of offshore wind turbine with tripod foundation[J]. Applied sciences, 2021, 11(4): 1718.
[9] 陈立,张浦阳. 三筒吸力式导管架基础循环承载特性研究[J]. 太阳能学报,2023. 44(11):382-386.
CHEN L, ZHANG P L.Study on cyclic bearing characteristics of tripod suction bucket foundations[J]. Acta energiae solaris sinica, 2023, 44(11): 382-386.
[10] NIELSEN K, SVENNINGSEN J, BARARI A, et al.On the cyclic stability diagram of offshore wind turbine supported on multiple foundations in saturated dense sand[J]. Engineering failure analysis, 2023, 144: 106926.
[11] NIKITAS G, VIMALAN N J, BHATTACHARYA S.An innovative cyclic loading device to study long term performance of offshore wind turbines[J]. Soil dynamics and earthquake engineering, 2016, 82: 154-160.
[12] 黄玉佩. 大直径单桩基础海上风机支撑结构动力性状[D]. 杭州: 浙江大学, 2017.
HUANG Y P.Dynamic behavior of offshore fan support structure with large diameter single pile foundation[D]. Hangzhou: Zhejiang University, 2017.
[13] LIANG R, YUAN Y, FU D F, et al.Cyclic response of monopile-supported offshore wind turbines under wind and wave loading in sand[J]. Marine georesources & geotechnology, 2021, 39(10): 1230-1243.
[14] VILLALOBOS JARA F, JARA F A V. Model testing of foundations for offshore wind turbines[D]. Oxford: Oxford University, 2006.
[15] LEBLANC C, BYRNE B W, HOULSBY G T.Response of stiff piles to random two-way lateral loading[J]. Géotechnique, 2010, 60(9): 715-721.
[16] BHATTACHARYA S, LOMBARDI D, MUIR WOOD D.Similitude relationships for physical modelling of monopile-supported offshore wind turbines[J]. International journal of physical modelling in geotechnics, 2011, 11(2): 58-68.
[17] GUO Z, YU L Q, WANG L Z, et al.Model tests on the long-term dynamic performance of offshore wind turbines founded on monopiles in sand[J]. Journal of offshore mechanics and Arctic engineering, 2015, 137(4): 041902.
[18] DNV G L.DNVGL-ST-0126: support structures for wind turbines[S]. Oslo, Norway: DNV GL, 2016.
[19] MALEKJAFARIAN A, JALILVAND S, DOHERTY P, et al.Foundation damping for monopile supported offshore wind turbines: a review[J]. Marine structures, 2021, 77: 102937.
[20] VERSTEIJLEN W G, RENTING F W, VAN DER VALK P L C, et al. Effective soil-stiffness validation: shaker excitation of an in situ monopile foundation[J]. Soil dynamics and earthquake engineering, 2017, 102: 241-262.