Vertical earthquake response of megawatt‐sized wind turbine with soil‐structure interaction effects
Vertical earthquake response of megawatt‐sized wind turbine with soil‐structure interaction effects
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DOI：
10.1002/eqe.2590
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发表时间：
2015-10
影响因子：
4.5
通讯作者：
R. A. Kjørlaug;A. Kaynia
中科院分区：
文献类型：
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作者：
R. A. Kjørlaug;A. Kaynia
研究了单桩风力发电机组在水平和垂直地震作用下的动力响应。采用SAP2000有限元程序进行分析。结构的有限元模型与振动台试验结果进行了验证，土模型的地震响应与均质地层稳态响应解析解进行了验证。本文的分析重点是风力发电机的竖向地震反应，包括土-结构相互作用的影响。采用三步法对非均匀地层和深层土壤进行了分析。此外，还实现了一个程序，该程序允许通过适当调整塔结构中的阻尼来执行耦合土-结构相互作用分析。分析表明，地面加速度对塔顶的影响放大了两倍。这些加速度能够造成涡轮机和塔结构的损坏，或者在地震后涡轮机发生故障；因此，即使在低至中震区，垂直地震激励也被认为是风力涡轮机设计中的潜在临界荷载。版权所有©2015 John Wiley & Sons， Ltd
The dynamic response of a wind turbine on monopile is studied under horizontal and vertical earthquake excitations. The analyses are carried out using the finite element program SAP2000. The finite element model of the structure is verified against the results of shake table tests, and the earthquake response of the soil model is verified against analytical solutions of the steady‐state response of homogeneous strata. The focus of the analyses in this paper is the vertical earthquake response of wind turbines including the soil‐structure interaction effects. The analyses are carried out for both a non‐homogeneous stratum and a deep soil using the three‐step method. In addition, a procedure is implemented which allows one to perform coupled soil‐structure interaction analyses by properly tuning the damping in the tower structure. The analyses show amplification of the ground surface acceleration to the top of the tower by a factor of two. These accelerations are capable of causing damage in the turbine and the tower structure, or malfunctioning of the turbine after the earthquake; therefore, vertical earthquake excitation is considered a potential critical loading in design of wind turbines even in low‐to‐moderate seismic areas. Copyright © 2015 John Wiley & Sons, Ltd.