基于复模态法的风电塔架体系地震反应分析
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摘要
以往对风电塔架研究大多采用刚性地基的假定,忽略土—结构的动力相互作用。然而风电塔架在实际地震时,由于地基的柔性和无限性,使得按刚性地基假定计算出来的结构动力特性和动力反应与将地基和结构作为一个整体计算出来的结果有较大差别。因此,考虑土—结构相互动力作用(SSI)的风电塔架地震响应分析研究十分必要。以华能阜新风力发电塔架为例,基于复模态法分析考虑土—结构相互作用风电塔架地震响应,首先建立土—风电塔架体系计算模型,采用Novak模型对伐板的复刚度、复阻尼计算,然后建立土—风电塔架相互作用体系的地震反应方程,采用复模态分析方法对结构地震反应求解,可供风电塔架抗震设计参考。
Formerly the windward electricity tower research mostly used the rigid ground the hypothesis,neglects the earth-structure the power interaction.However wind electricity tower when actual earthquake,as a result of the ground flexibility and the infinity,causes the structure dynamic performance which and the dynamic response calculates according to the rigid ground hypothesis with the ground and the structure takes the result which a whole calculates to have the wide difference.Therefore,consideration earth-structure mutual dynamic action (SSI) the wind electricity tower earthquake response analysis research is very essential.This article take China can the Fuxin wind power generation tower as an example,responds based on the duplicate modality law analysis consideration earth-structure interaction wind electricity tower earthquake,First establishes the earth-wind electricity tower system computation model,uses the Novak model to cut down the board the duplicate rigidity,the duplicate damping computation,then the establishment earth-wind electricity tower interaction system's earthquake response equation,uses the duplicate modal analysis method to respond to the structure earthquake solves,may supply the wind electricity tower aseismic design reference.
Formerly the windward electricity tower research mostly used the rigid ground the hypothesis,neglects the earth-structure the power interaction.However wind electricity tower when actual earthquake,as a result of the ground flexibility and the infinity,causes the structure dynamic performance which and the dynamic response calculates according to the rigid ground hypothesis with the ground and the structure takes the result which a whole calculates to have the wide difference.Therefore,consideration earth-structure mutual dynamic action (SSI) the wind electricity tower earthquake response analysis research is very essential.This article take China can the Fuxin wind power generation tower as an example,responds based on the duplicate modality law analysis consideration earth-structure interaction wind electricity tower earthquake,First establishes the earth-wind electricity tower system computation model,uses the Novak model to cut down the board the duplicate rigidity,the duplicate damping computation,then the establishment earth-wind electricity tower interaction system's earthquake response equation,uses the duplicate modal analysis method to respond to the structure earthquake solves,may supply the wind electricity tower aseismic design reference.
引文
[1]Novak M,Nogami T,Aboul-Ella F.Dynamic soil reactions for plane strain case[J].Journal of the EngineeringMechanics Divi-sion,ASCE,1978,104(4):953-959.
[2]Novak M,Aboul-Ella F.Impedance function of piles in layered media[J].Joumal of the Engineering Mechanics Division,ASCE,1978,104(3):643-661.
[3]Novak M,Sharnouby E.Stiffness constants of single piles[J].Journal of the Geotechnical Engineering Division,ASCE,1983,109(7):961-974.
[4]刘晶波,杜修力,欧进萍.结构动力学[M].北京:机械工业出版社,2005:288-300.
[2]Novak M,Aboul-Ella F.Impedance function of piles in layered media[J].Joumal of the Engineering Mechanics Division,ASCE,1978,104(3):643-661.
[3]Novak M,Sharnouby E.Stiffness constants of single piles[J].Journal of the Geotechnical Engineering Division,ASCE,1983,109(7):961-974.
[4]刘晶波,杜修力,欧进萍.结构动力学[M].北京:机械工业出版社,2005:288-300.
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