In this study, a new damping correction factor is proposed to provide an accurate design response spectrum for megawatt (MW) class wind turbines. The predicted response spectra show good agreement with those by time history analysis (THA). An equivalent modal damping of wind turbine support structures is then proposed for response spectrum method (RSM) based on the modal decomposition method for non‐classically damped structures. Seismic loadings on wind turbine towers and footings by RSM with the proposed damping correction factor and equivalent modal damping are also investigated and compared with those by THA. Finally, a quantile value between 0.5 and 0.85 in the damping correction factor is calibrated to ensure the same reliability level as evaluated by THA currently used for estimation of seismic loadings on support structures.

中文翻译：

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考虑支撑结构等效模态阻尼和可靠度的响应谱法预测风机支撑结构的地震荷载

在这项研究中，提出了一种新的阻尼校正因子，可为兆瓦级（MW）风力涡轮机提供准确的设计响应谱。预测的响应光谱与时程分析（THA）显示出良好的一致性。然后，基于非经典阻尼结构的模态分解方法，为响应谱方法（RSM）提出了风轮机支撑结构的等效模态阻尼。还研究了具有建议的阻尼校正因子和等效模态阻尼的RSM在风力涡轮机塔架和基础上的地震载荷，并将其与THA进行了比较。最后，对阻尼校正系数中介于0.5和0.85之间的分位数进行校准，以确保与当前用于估算支撑结构地震荷载的THA所评估的可靠性水平相同。