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循环荷载下四筒导管架基础抗弯承载特性试验研究

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海上风电基础在 25a服役期内会面临千万次的周期性荷载,为了研究循环荷载对四筒导管架基础抗弯极限承载力的影响,在砂土地基中开展了物理模型试验,介绍了四筒吸力式导管架筒型基础,并对砂土地基进行制备测试,系统分析了循环荷载幅值比、3 种不同的变幅加载方式对循环后单向极限承载力的影响,并对循环累积转角进行分析.同时将抗弯承载力与上述变量变化的关系进行了函数拟合.结果表明:循环荷载幅值比和抗弯承载力近似呈正比增长,筒周塑性变形区域的增大会导致循环累积转角呈现非线性增加.无论是增序还是减序方式的加载变幅值循环加载试验,对于超过 8 万次的长期循环作用来说,海上风力机的抗弯极限承载力的变化并不明显.
A study on bending moment bearing characteristics of tetrapod suction jackets in sandy soil after cycling
Offshore wind power foundations face tens of millions of cyclical loads over a 25-year service life.Therefore,a physical model test in the sandy soil foundation was carried out to study the influence of cyclic loading on the ultimate bending moment capacity of the tetrapod suction jackets.The cylindrical foundation of four-cylinder suction jacket was introduced,and the sand foundation was prepared and tested.The cyclic load amplitude ratio and the effect of three different ways of luffing loading on the unidirectional ultimate bearing capacity was systematically analyzed.The cyclic cumulative rotation angle was analyzed also.Simultaneously,the function fitting on the relationship between the bearing capacity and the change of above variables was performed.The results show that the amplitude ratio of cyclic loads and flexural capacity increase roughly in direct proportion,and that the plastic deformation around the tube foundation gradually increases,causing the accumulated rotation angle to increase nonlinearly.The ultimate bending moment capacity of the offshore wind turbine is not significantly affected by the variable-amplitude cyclic loading experiment,regardless of whether the loading is in increasing or decreasing order,for the long-term cyclic action of more than 80,000 times.

offshore wind powerbending moment capacitycyclic loadvariable amplitude loadaccumulated rotationplastic deformationstatic load testmulti-directional cyclic loading

陈立、张浦阳

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上海勘测设计研究院有限公司,上海 200335

天津大学水利工程智能建设与运维全国重点实验室,天津 300072

海上风电 抗弯承载力 循环荷载 变幅值荷载 累积转角 塑性变形 静载试验 多向循环加载

上海勘测设计研究院有限公司科研项目

2021FD8-022

2024

10.11991/yykj.202308018

应用科技
哈尔滨工程大学

应用科技

CSTPCD
影响因子：0.693
ISSN：1009-671X
年,卷(期)：2024.51(3)
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