[关键词]
[摘要]
为研究近海单桩风机塔架地震动力响应特性,以FAST v7软件为基础自编程开发地震分析模块,形成风机地震动力学耦合仿真平台S-FAST,并采用ABAQUS和Seismic软件验证其有效性。基于扩充的S-FAST平台,计算NREL 5 MW近海单桩风机塔架在湍流风、非规则波浪和地震作用下的动力响应。结果表明:地震是塔顶振动的控制荷载,风浪荷载可有效抑制塔顶振动;塔基面内弯矩主要由地震荷载引起,风浪荷载主要影响塔基面外弯矩;风浪荷载引起的塔基面外弯矩占风、波浪和地震耦合作用工况的69%;风浪荷载和地震荷载之间存在非线性耦合关系,结构设计时应采用全耦合的方法进行结构响应计算。
[Key word]
[Abstract]
In order to study the seismic dynamic response characteristics of monopile offshore wind turbine tower, the seismic analysis module was developed by selfprogramming based on FAST v7 to form the wind turbine seismic dynamic coupling simulation platform SFAST, and its effectiveness was verified by ABAQUS and Seismic softwares.Based on the extended SFAST platform, the dynamic response of NREL 5 MW monopile offshore wind turbine tower under the actions of turbulent wind, irregular wave and earthquake was calculated.The results show that earthquake is the control load of tower top vibration, and wind wave load can effectively suppress tower top vibration. The inplane bending moment of the tower base is mainly caused by seismic load, and wind wave load mainly affect the outofplane bending moment of the tower base. The calculation example shows that the outofplane bending moment of the tower base caused by wind wave load accounts for 69% of the coupled wind, wave and earthquake condition. There is a nonlinear coupling relationship between wind wave load and seismic load. The full coupling method should be used for structural response calculation in structural design.
[中图分类号]
TK83
[基金项目]
国家自然科学基金(51578444);陕西省教育厅重点科学研究计划项目(20JY032)