非线性波浪荷载下海上风电大直径单桩累积水平位移及卸载刚度试验研究

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中图分类号：TU473.1 文献标志码：A 文章编号：1673-3851（2026）05-0280-10

Reference Format：LEI Yilin，XIA Chentao，DENG Yuhong，etal.Experimental investigation on cumulative horizontal displacement andunloading stifnessof large-diameter monopiles forofshore wind turbines under nonlinear waveloads[J]. Journal of Zhejiang Sci-Tech University，2026，55（3） ：280-289.

Experimental investigation on cumulative horizontal displacement and unloading stiffness of large-diameter monopiles for offshore wind turbines under nonlinear wave loads

LEI Yilin，XIA Chentao，DENG Yuhong，LIU Kaifu （School of Civil Enginering and Architecture， Zhejiang Sci-Tech University，Hangzhou 3lOol8，China）

Abstract： To investigate the nonlinear wave loading effects on the cumulative horizontal displacement and unloading stiffness of large-diameter monopiles for ofshore wind turbines，a series of laboratory model tests were conducted to quantify the influence of first- and second-harmonic load amplitude，load frequency and number of cycles on cumulative horizontal displacement and unloading stiffness of largediameter monopiles. The results demonstrate that the increases in first- and second-harmonic load amplitude，load frequency and number of cycles allead to larger cumulative horizontal displacement of large-diameter monopiles. Unloading stiffness gradually decays with the increase in the number of cycles. An increase in the first-harmonic load amplitude will aggravate the decay of the unloading stifes. While a larger second-harmonic load amplitude，under the same number of cycles，results in greater unloading stiffness. At higher load frequencies， the initial unloading stiffness increases. However，the subsequent decay of stiffness with number of cycles also becomes more pronounced. This study reveals the influence of harmonic efects on the horizontal displacement accumulation and unloading stiffness degradationof large-diameter monopiles，and the relevant results can provide an experimental basis for asessing the long-term cyclic response and optimizing the design of offshore wind turbine monopiles subjected to nonlinear wave loads.

Key words： nonlinear wave loads；large-diameter monopile； second-harmonic；cumulative horizontaldisplacement; unloading stiffness

0引言

海上风电领域常用的基础类型主要有桩式基础、重力式基础和筒式基础[1]。（剩余13777字）