考虑土-结构相互作用的风力发电机塔架地震响应分析

Seismic Response Analysis of Wind Turbine Tower with Soil-Structure Interaction

摘要:

利用有限单元法建立用弹簧阻尼单元近似模拟土-结构相互作用的风力发电机塔架结构模型。采用更新的拉格朗日增量有限元格式,逐步积分的Newmark法求解,通过算例分析了多维地震荷载作用下风力机塔架结构的时程响应规律,研究了P-Δ效应、竖向地震作用和土-结构相互作用的影响。分析得出:土-结构相互作用对风力发电机塔架结构的地震动力响应的影响不容忽视,在材料线弹性范围内竖向地震荷载和P-Δ效应对结构的动力特性影响较小。

Abstract:

Using finite element method,a FEM model of wind turbine tower considering soil-structure interaction simulated by the spring-damping element is proposed to investigate its dynamic response under multi-dimension seismic excitation in time domain.The updated Lagrange FEM formalism is adapted to discrete the equation and to use Newmark integral method to solve it step by step.Through this numeral analysis on the influence of P-Δ effect,the effects of soil-structure interaction and vertical seismic action on structure＇s dynamic property,the time-history response rule for the tower is studied with a real example.The result show that the effect of the soil-structure interaction on the seismic response of wind turbine tower structure is significate and should not be ignored.In line elastic range,the influence of vertical seismic loads and the P-Δ effect are not notable.