强震作用下导管架基础结构特性分析

Characteristic analysis of jacket foundation structure under strong earthquake

海上风电导管架基础结构作为应用广泛的固定式海上风机基础之一,具有能适应较大水深、稳定性好的优点。采用时程分析法输入Northridge地震波,研究导管架基础结构的动力响应,结果表明塔筒顶端位移最大,位移随时间变化呈先增加后来减弱直至平稳的规律,与地震波加速度峰值相比,结构响应峰值存在一定的滞后,结构动力响应加速度不仅仅只与地震动峰值加速度有关,还与地震波波频谱特性有着很大的关系。越靠近桩底,结构等效应力越大,桩底处出现最大等效应力135 MPa。

As one of the widely-used fixed offshore wind turbine foundations,offshore wind power jacket infrastructure has advantages of being able to adapt to larger water depths and good stability.The time history analysis method was used to input Northridge seismic waves to study the dynamic response of the jacket foundation structure.The results show that the top of the tower has the largest displacement,the displacement increases with time and then weakens until it becomes stable.Compared with the peak acceleration of seismic waves,there is a certain lag in the peak response of the structure.The closer to the bottom of the pile,the greater the equivalent stress of the structure,and the maximum equivalent stress of 135 MPa appears at the bottom of the pile.