近场地震作用下近海单桩风机动力响应分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 230-240.

论文

近场地震作用下近海单桩风机动力响应分析

徐亚洲，段静

作者信息 +

Dynamic response analysis of offshore single pile wind turbine under near-field ground motion

XU Yazhou, DUAN Jing

Author information +

文章历史 +

摘要

基于FAST v7开发地震分析和土-结相互作用（Soil Structure Interaction，SSI）模块，形成气动-水动-地震-伺服-土结耦合仿真平台FAST-S，并采用Seismic和ABAQUS验证地震分析模块的计算精度和可靠性。通过扩展的FAST-S平台，建立考虑SSI效应的5MW近海单桩风机模型，分析风、波浪和地震之间的耦合效应以及研究近场地震动速度脉冲对停机和运行状态下风机支撑结构动力响应的影响。结果表明：地震加剧了塔顶振动，风浪荷载对减轻地震诱发的塔顶振动有一定作用；气动载荷、水动载荷和地震载荷之间存在非线性耦合关系，计算时应充分考虑风-浪-地震耦合效应；近场地震速度脉冲会增大停机和运行状态下风机的塔顶位移、塔顶加速度和泥线处弯矩，结构设计时应注意脉冲型地震动对结构产生的不利影响，特别是停机状态下风机的结构安全。
关键词：近海风机；地震分析模块；土-结相互作用；近场地震动；结构动力响应

Abstract

The seismic analysis and soil structure interaction module is developed based on FAST v7, forming an aero-hydro-seismic-servo-soil structure coupled simulation software FAST-S, and the calculation accuracy and reliability of the seismic analysis module is verified by Seismic and ABAQUS. Based on the extended software FAST-S, a 5MW monopile offshore wind turbine model considering SSI effect is established to analyze the coupling effect among wind, wave and earthquake, and to study the influence of the near-field ground motion velocity pulse on the dynamic response of the wind turbine support structure under parked and operational states. The results show that the earthquake intensifies the tower top vibration, and the wind-wave load plays a certain role in reducing the tower top vibration induced by the earthquake. There is a nonlinear coupling relationship among aerodynamic, hydrodynamic and seismic loadings, and the wind-wave-earthquake coupling effect should be fully considered in the calculation. Near-field ground motion velocity pulse will increase the tower top displacement, tower top acceleration and bending moment at the mudline of the wind turbine under parked and operational states. In the structure design, attention should be paid to the adverse effects of pulse-type ground motions on the structure, especially the structural safety of the wind turbine under the parked state.
Key words: offshore wind turbine; seismic analysis module; soil structure interaction; near-filed ground motion; structural dynamic response

导出引用

徐亚洲，段静. 近场地震作用下近海单桩风机动力响应分析[J]. 振动与冲击, 2022, 41(23): 230-240

XU Yazhou, DUAN Jing. Dynamic response analysis of offshore single pile wind turbine under near-field ground motion[J]. Journal of Vibration and Shock, 2022, 41(23): 230-240

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