摘要
为研究土-构耦合效应对下一代大型海上风力机地震动态响应的影响,通过对开源软件FAST进行二次开发,采用模态加速度法计算地震载荷,建立了海上风力机地震动力学仿真模型,并据此研究了考虑及忽略土-构耦合效应时15 MW风力机在正常运行工况和停机状态下的塔顶振动和支撑结构载荷变化特性。结果表明:土-构耦合效应虽然对地震诱导塔顶振动剧烈程度的影响较小,但在一定程度上抑制了停机时侧向振动的恢复;忽略土-构耦合效应将导致泥面处结构弯矩的预估值偏低约29.6%;考虑土-构耦合效应时,面内弯矩在地震结束后依然保持较大的变化幅度;针对海上风电结构抗震设计,应当考虑增加系统阻尼以及时降低由地震激励引起的面内载荷。
In order to investigate the effect of soil-structure interaction(SSI)on seismic behavior response of next-generation large offshore wind turbines,through the secondary development of the open source software FAST,a seismic dynamics simulation model of offshore wind turbine was established by using the modal acceleration method to calculate the seismic load.Accordingly,the characteristics of the vibration at the top of the tower and the load variation of the support structure of the 15 MW monopile wind turbine under the operation and shutdown conditions were investigated considering and neglecting the soil-structure coupling effect.Results show that although the SSI has a small effect on the severity of tower top vibration induced by earthquake,it suppresses the recovery of lateral vibration during shutdown to a certain extent;ignoring the soil-structure coupling effect will lead to a lower predicted value of the structural bending moment at the mud surface by about 29.6%;when considering the SSI effects,the in-plane bending moment still maintains a large change in magnitude after the earthquake ends;for the seismic design of offshore wind power structures,it should consider increasing the system damping to reduce the in-plane loads caused by seismic excitation in time.
作者
梅轩
杨阳
MEI Xuan;YANG Yang(College of Civil Engineering,Tongji University,Shanghai 200092,China;Faculty of Maritime and Transportation,Ningbo University,Ningbo 315211,Zhejiang Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2022年第3期269-275,285,共8页
Journal of Chinese Society of Power Engineering
基金
上海市浦江人才计划资助项目(2019PJD054)。
关键词
风力机
地震
土-构耦合
动态响应
wind turbine
earthquake
soil-structure interaction
dynamic response
作者简介
梅轩(1990-),男,上海人,博士后,主要从事海上风电基础结构设计等方面的研究;通信作者:杨阳,男,副教授,博士,电话(Tel.):15216702797,E-mail:yangyangl@nbu.edu.cn。
