| 考虑冲刷深度的海上风机地震易损性研究 |
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| 引用本文： | 李芬,王屹之,洪子博,胡丹.考虑冲刷深度的海上风机地震易损性研究[J].水利水运工程学报,2022,0(4):123-130. |
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| 作者姓名： | 李芬 王屹之 洪子博 胡丹 |
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| 作者单位： | 武汉理工大学 船海能动学院，湖北 武汉 430063 |
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| 基金项目： | 中央高校基本科研业务费专项资金资助项目（WUT2021IVA009） |
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| 摘 要： | 在地震和波浪等复杂环境荷载作用下，海上风机的桩周冲刷和地震动水压力会显著影响海上风机的动力响应。建立了考虑地震动水压力及桩周冲刷效应的海上风机非线性动力计算模型，首先基于场地相关反应谱选取了34条地震动记录，通过多条带分析方法获取了不同工况下海上风机的地震易损性曲线，进一步讨论了地震动水压力和冲刷深度对海上风机地震易损性的影响。研究表明:在一般设防烈度下，冲刷深度对海上风机受到地震荷载作用时能否正常工作有显著影响，对风机发生永久性破坏概率的影响较小；而动水压力对海上风机4种极限状态下的地震易损性的影响均较小。海上风机易损性分析可为海上风机的抗震设计提供一定的理论指导，并具工程应用价值。
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| 关 键 词： | 冲刷 地震动水压力 桩基础 地震易损性 海上风机 |
| 收稿时间： | 2021-06-30 |
Seismic fragility of offshore wind turbine considering scour depth |
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| Affiliation: | School of Transportation, Wuhan University of Technology, Wuhan 430063, China |
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| Abstract: | The geological conditions in the eastern coastal areas of China are complex, and the saturated soft clay around the offshore wind turbine foundation may be affected by the local erosion and dynamic water pressure conditions around the pile under the cyclic action of earthquake and waves. In this study, a nonlinear dynamic model of offshore wind turbine considering earthquake hydraulic pressure and scour effects was established. A total of 34 earthquake records were selected based on the site target response spectrum. Based on the multi-band analysis method, the seismic vulnerability curves of offshore wind turbine under various working conditions were obtained, and the influence of earthquake hydro-dynamic pressure and scour depth on the seismic vulnerability of offshore wind turbines was discussed further. The results indicate that under the seismic fortification intensity, the scour depth has a significant impact on the normal operation of offshore wind turbine under seismic load, but has marginal effect on the permanent failure of wind turbine. By comparison, the hydrodynamic pressure has little effect on the seismic vulnerability under different limit states. The vulnerability analysis of offshore wind turbine can serve as a guidance for the seismic design of offshore wind turbine. |
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