| 近断层地震动作用下风机塔地震反应分析 |
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| 引用本文： | 徐亚洲,田晓航,张慧,于军琪.近断层地震动作用下风机塔地震反应分析[J].地震工程与工程振动,2020(1):57-66. |
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| 作者姓名： | 徐亚洲 田晓航 张慧 于军琪 |
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| 作者单位： | 西安建筑科技大学土木工程学院;西安建筑科技大学建筑设备科学与工程学院 |
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| 基金项目： | 国家自然科学基金项目(51578444);重点研发计划(2017YFC0704104-03);陕西省自然科学基础研究计划(2019JQ-356)~~ |
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| 摘 要： | 为了研究近断层地震动速度脉冲及强竖向地震动对风机塔地震响应的影响,以某陆上风电场1.5 MW风机塔为研究对象开展了结构在水平向脉冲型地震动、水平向非脉冲型地震动、水平与竖向地震动组合3种地震输入工况的时程分析。通过3种工况下塔顶位移时程、加速度时程、塔底剪力、弯矩及轴力的对比分析发现:近断层速度脉冲对结构塔顶水平位移、塔顶水平加速度、塔底剪力与弯矩均影响显著;竖向地震动会加大结构的塔顶竖向加速度响应及塔底轴力响应;随着竖向与水平加速度峰值比增大,塔顶竖向加速度响应增大,最大轴力随着峰值比增大而增大,最小轴力随着峰值比增大而减小。此外,增量动力分析表明,采用自接触的有限元模型可以更真实地预测风机塔的失稳破坏机制。
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| 关 键 词： | 近断层地震动 速度脉冲 竖向地震作用 风机塔结构 自接触 |
Seismic response analysis of wind turbines subjected to near-fault ground motions |
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| XU Yazhou,TIAN Xiaohang,ZHANG Hui,YU Junqi.Seismic response analysis of wind turbines subjected to near-fault ground motions[J].Earthquake Engineering and Engineering Vibration,2020(1):57-66. |
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| Authors: | XU Yazhou TIAN Xiaohang ZHANG Hui YU Junqi |
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| Institution: | (Schoolof Civil Engineering Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Building Services Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China) |
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| Abstract: | In order to study the influence of near-fault ground motion velocity pulse and vertical ground motions on the seismic response of wind turbine towers,a 1.5 MW wind turbine tower of a land wind farm was investigated by performing the time history analysis under three cases of seismic inputs,i.e.ground motions with horizontal velocity pulse,without horizontal velocity pulse,and combination of both horizontal and vertical components.The top displacement and acceleration,bottom shear force,bending moment and axial force of the tower were comprehensively analyzed.It is found that the near-fault velocity pulse has a significant effect on the horizontal displacement and acceleration on the top of tower,the shear force and bending moment at the bottom of the tower.The vertical ground motion would cause the increase of the vertical acceleration of the top tower and the axial forces at the bottom of the tower.With the increase of the ration of the vertical peak ground acceleration to peak horizontal acceleration,the vertical acceleration response of the top tower and the maximum axial force at the base increase,while the minimum axial force decreases.Moreover,the incremental dynamic analysis indicates that the FEM model considering the self-contact mechanism predicts the buckling failure mode reasonably. |
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| Keywords: | near-fault ground motion velocity pulse vertical seismic action wind turbine tower structure self-contact |
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