长期水平荷载对单桩式海上风机结构自振频率的影响分析

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摘要海上风机结构体系长期经受波浪、风等水平循环荷载的作用，从而引起地基刚度变化，海上风机结构体系属于动力敏感型结构，预测其自振频率的长期变化具有非常重要的工程意义。基于动力运动方程，考虑了桩土相互作用，通过嵌入地基刚度衰减模型考虑长期循环荷载引起的地基刚度变化，建立了单桩式海上风机结构自振频率的简化计算方法，利用实际工程和数值模拟验证了方法的可行性。最后通过开展参数分析，探讨长期循环荷载大小、加载次数对海上风机结构自振频率的影响规律；结果表明，循环荷载的增大、加载次数的增加会导致海上风机结构体系自振频率较小，风机结构体系的自振频率应偏移1P；该方法可以评估长期循环荷载下单桩式海上风机结构自振频率的变化，为近海风机结构自振频率的设计提供参考。

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	孙毅龙1
	许成顺1
	席仁强1
	2
	杜修力1
	豆鹏飞1
	3

关键词 ：海上风机, 单桩基础, 长期循环荷载, 自振频率

Abstract：Offshore wind turbine structures usually suffer wave, wind and other external lateral cyclic loads. The long-term cyclic loadings cause the variation of foundation stiffness. The offshore wind turbine structural system is sensitive to these dynamic cyclic loads, so it is very important to predict the long-term effect of cyclic loading on the natural frequency. This study developed a method to analyze the natural frequency of offshore wind turbine structural system with considering soil-pile interaction and the effect of long-term cyclic loading. This method is based on the kinematic equation of the damped system, considering the long-term effect of cyclic loading on the foundation stiffness by embedding the foundation stiffness degradation model. This method was then validated against engineering data and numerical calculation. Parameter studies were conduct to present the influence of the cyclic loading amplitude, cyclic number and pile diameter on the natural frequency of offshore wind turbine structure system by using the developed method. The results showed that the natural frequency of the offshore wind turbine structural system would decrease with increasing cyclic loading amplitude and cyclic number, and the natural vibration frequency of the fan structural system would be biased towards 1P with increasing the cyclic number. This method can be used to evaluate the natural frequency of monopile supported offshore wind turbine structure under the long-term cyclic loading, and provide some reference for the design of natural frequency of offshore wind turbine.

Key words： offshore wind turbine Monopile Long-term cyclic loading Natural frequency

收稿日期: 2022-01-05 出版日期: 2023-01-28

引用本文:

孙毅龙1，许成顺1，席仁强1,2，杜修力1，豆鹏飞1,3. 长期水平荷载对单桩式海上风机结构自振频率的影响分析[J]. 振动与冲击, 2023, 42(2): 108-115.
SUN Yilong1，XU Chengshun1，XI Renqiang1,2，DU Xiuli1，DOU Pengfei1,3. Effect of long-term horizontal load on the natural frequency of monopile supported offshore wind turbine structures. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(2): 108-115.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I2/108

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