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极端地震作用下近海风电结构反应的数值模拟涉及几方面问题:塔筒-基础-地基-边界系统有限元模型建立的合理与便利性;地震作用联合波浪力作用;不同地震波对风电结构体系不同作用特点.首先,开发了塔筒-复合筒型基础-地基-透射边界的可视化智能建模程序TJU.WPS(Wind Power Structure).然后,计算分析大震和波浪联合作用的风电结构动力响应,研究结构体系的地震反应对波浪力和不同地震波的敏感性;最后,分析超大震作用下风电结构的倒塌破坏模式.结果表明,(1)开发的TJU.WPS程序界面友好方便、快捷、实用可靠;(2)分析并解释了天津波、迁安波和Taft波3种典型地震动及与波浪力共同作用时风机结构振动的频谱特性,强调了波浪力的不容忽视性:与单独输入地震波相比,波浪力能够显著改变结构动力响应功率谱中能量的分布;(3)论述了3种典型地震动作用下风机结构的破坏模式相同点及其区别:超大震作用下风机结构都将脱开地基向上运动,最终回落到地基,但是风机结构脱开地基所需的不同地震波的最小峰值及脱开时刻不同.
The numerical simulation of the offshore wind-induced structural response under extreme earthquakes involves several aspects: the reasonable and convenient establishment of the finite element model of the tower-foundation-foundation-boundary system; the interaction of the seismic action with the wave force; the different effects of different seismic waves on the wind power structure system Characteristics.Firstly, a visual intelligent modeling program TJU.WPS (Wind Power Structure) was developed for the tower-composite tubular foundation-foundation-transboundary boundary.Based on the analysis of the dynamic response of the wind power structure with the combined effect of large earthquakes and waves, The seismic response of the structural system to wave forces and different seismic waves is analyzed.Finally, the collapsing failure mode of the wind power structure under the effect of super-large earthquake is analyzed.The results show that: (1) the interface of TJU.WPS program developed is friendly, convenient, fast, practical and reliable; (2) The spectral characteristics of three typical ground motions of Tianjin, Qian’an and Taft waves are analyzed and explained, and the vibration characteristics of the wind turbine structure when combined with wave forces are emphasized. The emphasis of the wave force can not be neglected. Compared with the input of seismic waves alone, Wave force can significantly change the energy distribution in the power spectrum of the dynamic response of the structure. (3) The failure of the fan structure under three kinds of typical ground motions Different minimum peak time and disengaging the large earthquakes turbine foundation structure are disengaged upward movement, eventually down to the foundation, but the structure of the fan required for disengaging FOUNDATION different waves: the same pattern points and their differences.