考虑土―结构相互作用的运转状态风电塔抗震分析

针对某陆上风电场1.5 MW风电塔结构,建立了"塔筒―基础―地基"整体三维精细有限元模型,研究土―结构相互作用对风机运转状态下风电塔结构地震动力响应的影响规律.在风机运转状态下,使用FAST程序把风速时程转化为风荷载时程输入模型,并使用EERA程序进行土层地震反应分析得到模型土层底部的地震波,作为地震激励进行输入,对风电塔进行模态分析并计算风电塔地震动力响应.研究表明,考虑土―结构相互作用效应会引起风电塔体系自振频率降低,并显著增加风电塔的结构动力响应.

Seismic response analyses of a wind turbine under operating conditions considering soil--structure interaction

A detailed three-dimensional finite element model including soil-structure interaction was developed for a 1. 5 MW on-shore wind turbine. A comparative study was performed to investigate the soil- structure interaction ( SSI) effects on the seismic re-sponses of the wind turbine under operating conditions. Wind speed time histories were converted to wind load time histories under the operating condition by using the FAST program. Simulation analysis was conducted using the EERA program to derive earthquake exci-tations at the base of the soil model. Then modal analyses and seismic response analyses were performed. The results show that soil-structure interaction has significant influences on the dynamic characteristics of the wind turbine tower, which results in amplification of the structural responses.