月星环球博览中心超高层建筑顶部钢构架分析
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摘要
历次震害表明,地震作用下屋顶上的塔楼地震反应强烈,常发生严重破坏,产生显著的"鞭梢效应"。而通常的设计方法往往无法模拟此类效应。本文结合月星环球博览中心复杂高层公建项目,采用等效粘滞阻尼比来考虑顶部钢塔楼和主体结构不同的阻尼耗能特性,通过整体和局部模型的对比,分别从阻尼比、动力特性、基底反力、顶部位移、高阶振型等方面分别研究了非比例阻尼及"鞭梢效应"对高层混合结构顶部钢塔楼地震反应的影响,为今后同类项目的抗震设计提供一定的参考和依据。
Previous seismic damages showed that,the steel frame tower built atop on the roof of high-rises usually produced a dramatic "Whiplash Effect" under earthquake,which cannot be simulated by conventional design methods.In this paper,by comparing the analysis results of the whiplash effect of the partial and whole models,the whiplash effect on the steel tower built atop on the high-rises was analysed,through the aspect of damping ratio,dynamic characteristic,base reaction,top displacement and high-order mode.Meanwhile,this paper may also provide some references for related designs in the future.
Previous seismic damages showed that,the steel frame tower built atop on the roof of high-rises usually produced a dramatic "Whiplash Effect" under earthquake,which cannot be simulated by conventional design methods.In this paper,by comparing the analysis results of the whiplash effect of the partial and whole models,the whiplash effect on the steel tower built atop on the high-rises was analysed,through the aspect of damping ratio,dynamic characteristic,base reaction,top displacement and high-order mode.Meanwhile,this paper may also provide some references for related designs in the future.
引文
[1]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[2]全国民用建筑工程设计技术措施-结构(2009年版)[S].北京:中国建筑标准设计研究院,2009.
[3]张相庭.结构风压和风振计算[M].上海:同济大学出版社,1985.
[4]吴晓莉,陈乾,吴志彬.顶部安装钢塔的高层建筑结构简化设计[J].结构工程师,2008,24(4).
[5]何益斌,樊海涛,周绪红,等.钢筋混凝土结构非线性阻尼地震反应谱研究[J].建筑结构学报,2010,31(3).
[6]WILSON E L,YUAN M W,DICKENS J M.Dynamicanalysis by direct superposition of Ritz vector[J].Earthquake Engineering and Structural Dynamics,1982,10(6).
[7]KIMURA EIICHI,KONNO TOMONORI.Earthquakeeffects on steel tower for microwave antennas atopbuilding[J].Review of the Electrical CommunicatonLaboratories,1975,23(3-4).
[2]全国民用建筑工程设计技术措施-结构(2009年版)[S].北京:中国建筑标准设计研究院,2009.
[3]张相庭.结构风压和风振计算[M].上海:同济大学出版社,1985.
[4]吴晓莉,陈乾,吴志彬.顶部安装钢塔的高层建筑结构简化设计[J].结构工程师,2008,24(4).
[5]何益斌,樊海涛,周绪红,等.钢筋混凝土结构非线性阻尼地震反应谱研究[J].建筑结构学报,2010,31(3).
[6]WILSON E L,YUAN M W,DICKENS J M.Dynamicanalysis by direct superposition of Ritz vector[J].Earthquake Engineering and Structural Dynamics,1982,10(6).
[7]KIMURA EIICHI,KONNO TOMONORI.Earthquakeeffects on steel tower for microwave antennas atopbuilding[J].Review of the Electrical CommunicatonLaboratories,1975,23(3-4).
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