基于修正的广义风荷载谱的输电塔架风振系数计算方法
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摘要
本文分析并指出了《架空送电线路杆塔结构设计技术规定》(DL/T5154-2002)中关于计算输电塔风振系数条文中存在的问题,引进了基于输电塔气弹模型风洞试验数据得到的输电塔顺风向1阶广义风荷载谱模型,并对其进行了地貌和振型修正。详细推导了基于修正的输电塔1阶广义风荷载谱计算其风振系数的方法,采用该方法计算了某大跨越输电塔的风振系数,并且与基于准定常理论采用Daven-port谱和规范方法计算得到的风振系数进行比较,所得结论具有重要的参考价值,可以直接为输电线路工程设计提供借鉴。
The problems existing in the items referred to calculating the gust response factors of power transmission tower in "Technical regulation of design for tower and pole structures of overhead transmission line" are pointed out and analyzed in this paper.A model of generalized wind power spectrum of power transmission tower in along-wind obtained by wind tunnel tests of aero-elastic model is introduced.The spectrum is revised according to different wind field categories and mode shapes.A method of calculating the gust response factors of power transmission tower based on the revised generalized wind power spectrum are recommended in detail.The gust response factors of a large span power transmission tower are calculated by the method introduced in this paper.The results are compared with that calculated based on the quasi-steady theory and Davenport wind power spectrum and that calculated according to the design code.Some important referable conclusions are summarized and supply references for design of power transmission tower.
The problems existing in the items referred to calculating the gust response factors of power transmission tower in "Technical regulation of design for tower and pole structures of overhead transmission line" are pointed out and analyzed in this paper.A model of generalized wind power spectrum of power transmission tower in along-wind obtained by wind tunnel tests of aero-elastic model is introduced.The spectrum is revised according to different wind field categories and mode shapes.A method of calculating the gust response factors of power transmission tower based on the revised generalized wind power spectrum are recommended in detail.The gust response factors of a large span power transmission tower are calculated by the method introduced in this paper.The results are compared with that calculated based on the quasi-steady theory and Davenport wind power spectrum and that calculated according to the design code.Some important referable conclusions are summarized and supply references for design of power transmission tower.
引文
[1]Holmes,J.D.Along-wind responses of lattice tower:part I─derivation of expressions for gust response factors[J].Engineering Structures,1994,Vol.16,No.4:287-292
[2]Holmes,J.D.Along-wind responses of lattice tower:partⅡ—aerody-namics damping and deflections[J].Engineering Structures,1996,Vol.18,No.7:483-488
[3]Holmes,J.D.,Along-wind responses of lattice tower:partⅢ—effective load distributions[J].Engineering Structures,1996,VoL.18,No.(7):489-494
[4]Juhasova,E.Quasi-static versus dynamic space wind response of slen-der structures[J].J.of Wind Eng.&Indus.Aerodyn.,1997:69-71,757-766
[5]Yasui,H.,H.Marukawa,Y.Momomura,T.Ohkuma:Analytic study on wind-induced vibration of power transmission towers[J].J.of Wind Eng.&Indus.Aerodyn,1999,83,431-441
[6]Shuguo Liang,Lianghao Zou,Lin Zhao,Yaojun Ge.The Generalized Force Spectrumof Along-wind Loads on Lattice Towers[A].Proceed-ings of The Sixth Asia-Pacific Conference on Wind Engineering,Soul,Korea,2005:943-952
[7]架空送电线路杆塔结构设计技术规定(DL/T5154-2002)[M].北京:中国电力出版社,2002
[8]建筑结构荷载规范(GB50009-2001)[M].北京:中国建筑工业出版社,2002
[9]梁枢果,邹良浩,赵林,等.格构式塔架动力风荷载解析模型[J].同济大学学报(自然科学版),2008,36(2):166-171
[10]Yin Zhou,Ahsan Kareem,Ming Gu.Mode shape corrections for wind load effects[J].Journal of engineering mechanics,2002,128(1):15-23
[11]张相庭,结构风压和风振计算[M].上海:同济大学出版社,1985
[12]埃米尔.希缪,罗伯特.H.斯坎论.风对结构的作用—风工程导论[M].刘尚培,项海帆,谢霁明译.上海:同济大学出版社,1992
[13]李宏男,王信前.大跨越输电塔线体系的动力特性[J].土木工程学报,30(5),1997:28-36
[14]梁枢果,朱继华,王力争.大跨越输电塔~线体系动力特性分析[J].地震工程与工程振动,23(6),2003:63-69
[15]邓洪州,朱松晔,王肇民.大跨越输电塔线体系动力特性及风振响应[J].建筑结构,34(7),2004:25-28
[16]冯云巍.输电塔架ANSYS建模及动力特性研究[J].钢结构,23(103),2008:21-23
[2]Holmes,J.D.Along-wind responses of lattice tower:partⅡ—aerody-namics damping and deflections[J].Engineering Structures,1996,Vol.18,No.7:483-488
[3]Holmes,J.D.,Along-wind responses of lattice tower:partⅢ—effective load distributions[J].Engineering Structures,1996,VoL.18,No.(7):489-494
[4]Juhasova,E.Quasi-static versus dynamic space wind response of slen-der structures[J].J.of Wind Eng.&Indus.Aerodyn.,1997:69-71,757-766
[5]Yasui,H.,H.Marukawa,Y.Momomura,T.Ohkuma:Analytic study on wind-induced vibration of power transmission towers[J].J.of Wind Eng.&Indus.Aerodyn,1999,83,431-441
[6]Shuguo Liang,Lianghao Zou,Lin Zhao,Yaojun Ge.The Generalized Force Spectrumof Along-wind Loads on Lattice Towers[A].Proceed-ings of The Sixth Asia-Pacific Conference on Wind Engineering,Soul,Korea,2005:943-952
[7]架空送电线路杆塔结构设计技术规定(DL/T5154-2002)[M].北京:中国电力出版社,2002
[8]建筑结构荷载规范(GB50009-2001)[M].北京:中国建筑工业出版社,2002
[9]梁枢果,邹良浩,赵林,等.格构式塔架动力风荷载解析模型[J].同济大学学报(自然科学版),2008,36(2):166-171
[10]Yin Zhou,Ahsan Kareem,Ming Gu.Mode shape corrections for wind load effects[J].Journal of engineering mechanics,2002,128(1):15-23
[11]张相庭,结构风压和风振计算[M].上海:同济大学出版社,1985
[12]埃米尔.希缪,罗伯特.H.斯坎论.风对结构的作用—风工程导论[M].刘尚培,项海帆,谢霁明译.上海:同济大学出版社,1992
[13]李宏男,王信前.大跨越输电塔线体系的动力特性[J].土木工程学报,30(5),1997:28-36
[14]梁枢果,朱继华,王力争.大跨越输电塔~线体系动力特性分析[J].地震工程与工程振动,23(6),2003:63-69
[15]邓洪州,朱松晔,王肇民.大跨越输电塔线体系动力特性及风振响应[J].建筑结构,34(7),2004:25-28
[16]冯云巍.输电塔架ANSYS建模及动力特性研究[J].钢结构,23(103),2008:21-23
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