考虑土-结构相互作用的风力发电机塔架地震响应分析
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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。
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.
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.
引文
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[2]朱春良,杨春田,于淑琴,等.烟囱竖向地震响应的试验与研究[J].特种结构,2002,19(3):34-37.
[3]陈健云,周晶,马恒春,等.高耸烟囱结构竖向地震响应的模型试验研究及分析[J].建筑结构学报,2005,26(2):87-93.
[4]张玉梅,朱玉普,张晓东.多向地震耦合作用下高耸结构土-结构动力相互研究[J].工程力学,2008,25(2):154-159.
[5]刘铁林,姜迎春,刘伟.地震作用下高耸结构动力响应波动分析方法[J].工程力学,2008,25(增刊Ⅱ):164-167.
[6]Zhao X,Maiβer P.Seismic response analysis of wind turbinetowers including soil-structure interaction[A]∥Proc.IMechE[C].220Part K:J.Multi-body Dynamics,2006:53-61.
[7]贺广零.考虑土-结构相互作用的风力发电高塔系统地震动力响应分析[J].机械工程学报,2009,45(7):87-94.
[8]贺广零,周勇,李杰.风力发电高塔系统地震动力响应分析[J].工程力学,2009,26(7):72-77.
[9]Wolf J P.Spring-dashpot-mass models for foundation vibra-tions[J].J.Earthq.Eng.Struct.Dyn.,1997,26:931-949.
[10]Klaus-Jǔrgen Bathe.Finite Element Procedures[M].Up-per Sandle River,New Jersey:Prentice-Hall,1996:485-575.
[11]爱德华.L.威尔逊著.北京金土木软件技术有限公司中国建筑标准设计研究院译.结构静力与动力分析[M].北京,中国建筑出版社,2006:101-110.
[12]李声艳.大型风力发电机组的动力学特性计算分析[D].天津:天津工业大学,2007.
[13]王恒知,石玉成,卢育霞,等.人工拟合地震动时程参数对场地反应的影响分析[J].西北地震学报,2009,31(2):126-130.
[14]王国波,杨林德.上海软土自由场地的三维地震响应分析[J].西北地震学报,2008,30(4):27-31.
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