工程科学学报，第41卷，第10期：1351-1359,2019年10月 Chinese Journal of Engineering,Vol.41,No.10:1351-1359,October 2019 D0I:10.13374/j.issn2095-9389.2019.01.20.001:http://journals..usth.edu.cn 冲刷深度对海上风电塔地震动力响应的影响分析 宋 波12)，赵伟娜12)四，双妙2) 1)北京科技大学土木与资源工程学院，北京1000832)北京科技大学强震区轨道交通工程抗震研究北京市国际科技合作基地，北京 100083 ☒通信作者，E-mail:zhaownl221@163.com 摘要基于某海上风电塔进行现场监测、有限元模拟及室内振动台试验研究，考虑桩-土相互作用并对结构进行精细化数 值模拟分析，研究了不同冲刷深度下结构自振周期的变化及不同冲刷深度对结构地震动作用下动力响应的影响规律.现场监 测结果表明：6#风机结构受海水冲刷严重，与同时期建造的15#风机相比振动幅度明显，说明冲刷深度对结构的影响不可忽 略.数值模拟分析表明：冲刷深度主要影响结构高阶振型，使结构自振周期变长，增幅最大达33%.由于冲刷致使土层对高柔 性结构约束减弱，结构将产生大的振动进而导致风机停摆；在遭遇7度罕遇地震时，应立即停止发电工作.室内缩尺振动台试 验与数值模拟所得结果的变化曲线较为均匀，趋势上较吻合，充分验证了数值模拟的准确性. 关键词海上风电塔：冲刷深度：现场监测：振动特性：地震动力响应 分类号TU333 Analysis of the influence of scour depth on the dynamic response of offshore wind turbine towers under earthquake action SONG Bo'2),ZHAO Wei-na),SHUANG Miao2) 1)School of Civil and Resource Engineering.University of Seience and Technology Beijing.Beijing 100083.China 2)Beijing Interational Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area,Uni- versity of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:zhaown1221@163.com ABSTRACT The operational environment of offshore wind turbine towers is complex,and the harsh service environment makes them more vulnerable to damage under conditions of complex stress such as sea water scouring.The scouring pit has a great influence on the vibration of wind turbine towers.It is of great importance to study the dynamic response to earthquakes of wind turbine towers under scouring depths.The research object of this study was a wind turbine tower at a wind farm in Jiangsu Province,which had a seven-de- gree seismic fortification in the area.Based on finite element simulation,on-site monitoring and a shaking table test of the offshore wind tower,and considering pile-soil interaction in a refined model,variation in the natural vibration period of the structure under different scouring depths and the influence of different scouring depths on the dynamic response of the structure under seismic excitation were studied.On-site monitoring results show that the #6 wind turbine structure is seriously eroded by sea water,and the vibration amplitude is clear compared with the #15 wind turbine built in the same period.These aspects indicate that the influence of scouring depth on the structure could not be ignored.Analysis of numerical simulation show that scouring depth has a great influence on the high-order mode of the structure,which lengthen the natural vibration period of the structure by a maximum of 33%.On account of scouring,con- straints of the soil layer on the highly flexible structure were weakened,and the structure produced considerable vibration,which could lead to damage of structures such as wind towers.Results also indicate that when encountering a seven-degree rare earthquake,power 收稿日期：2019-01-20 基金项目：国家重点研发计划重点专项(2017YFF0205003):国家自然科学基金资助项目(51178045)：教育部海外名师项目(MS2011B)KJ005)工程科学学报,第 41 卷,第 10 期:1351鄄鄄1359,2019 年 10 月 Chinese Journal of Engineering, Vol. 41, No. 10: 1351鄄鄄1359, October 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2019. 01. 20. 001; http: / / journals. ustb. edu. cn 冲刷深度对海上风电塔地震动力响应的影响分析 宋 波1,2) , 赵伟娜1,2) 苣 , 双 妙1,2) 1) 北京科技大学土木与资源工程学院, 北京 100083 2) 北京科技大学强震区轨道交通工程抗震研究北京市国际科技合作基地, 北京 100083 苣通信作者,E鄄mail: zhaown1221@ 163. com 摘 要 基于某海上风电塔进行现场监测、有限元模拟及室内振动台试验研究,考虑桩鄄鄄土相互作用并对结构进行精细化数 值模拟分析,研究了不同冲刷深度下结构自振周期的变化及不同冲刷深度对结构地震动作用下动力响应的影响规律. 现场监 测结果表明:6#风机结构受海水冲刷严重,与同时期建造的 15#风机相比振动幅度明显,说明冲刷深度对结构的影响不可忽 略. 数值模拟分析表明:冲刷深度主要影响结构高阶振型,使结构自振周期变长,增幅最大达 33% . 由于冲刷致使土层对高柔 性结构约束减弱,结构将产生大的振动进而导致风机停摆;在遭遇 7 度罕遇地震时,应立即停止发电工作. 室内缩尺振动台试 验与数值模拟所得结果的变化曲线较为均匀,趋势上较吻合,充分验证了数值模拟的准确性. 关键词 海上风电塔; 冲刷深度; 现场监测; 振动特性; 地震动力响应 分类号 TU33 + 3 收稿日期: 2019鄄鄄01鄄鄄20 基金项目: 国家重点研发计划重点专项(2017YFF0205003);国家自然科学基金资助项目(51178045);教育部海外名师项目(MS2011BJKJ005) Analysis of the influence of scour depth on the dynamic response of offshore wind turbine towers under earthquake action SONG Bo 1,2) , ZHAO Wei鄄na 1,2) 苣 , SHUANG Miao 1,2) 1) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing International Cooperation Base for Science and Technology鄄Aseismic Research of the Rail Transit Engineering in the Strong Motion Area, Uni鄄 versity of Science and Technology Beijing, Beijing 100083, China 苣Corresponding author, E鄄mail: zhaown1221@ 163. com ABSTRACT The operational environment of offshore wind turbine towers is complex, and the harsh service environment makes them more vulnerable to damage under conditions of complex stress such as sea water scouring. The scouring pit has a great influence on the vibration of wind turbine towers. It is of great importance to study the dynamic response to earthquakes of wind turbine towers under scouring depths. The research object of this study was a wind turbine tower at a wind farm in Jiangsu Province, which had a seven鄄de鄄 gree seismic fortification in the area. Based on finite element simulation, on鄄site monitoring and a shaking table test of the offshore wind tower, and considering pile鄄soil interaction in a refined model, variation in the natural vibration period of the structure under different scouring depths and the influence of different scouring depths on the dynamic response of the structure under seismic excitation were studied. On鄄site monitoring results show that the #6 wind turbine structure is seriously eroded by sea water, and the vibration amplitude is clear compared with the #15 wind turbine built in the same period. These aspects indicate that the influence of scouring depth on the structure could not be ignored. Analysis of numerical simulation show that scouring depth has a great influence on the high鄄order mode of the structure, which lengthen the natural vibration period of the structure by a maximum of 33% . On account of scouring, con鄄 straints of the soil layer on the highly flexible structure were weakened, and the structure produced considerable vibration, which could lead to damage of structures such as wind towers. Results also indicate that when encountering a seven鄄degree rare earthquake, power