复杂形体超高层钢框架-混凝土核心筒混合结构减震的研究
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摘要
以拟建超高宁夏电视塔(NXTVT)工程为背景,利用SAP2000建立其三维有限元分析模型。超高宁夏电视塔呈现底部小、上部大、中部略呈细腰形的花瓶状复杂形体;而且,楼层的不连续分布导致结构质量和侧向刚度沿竖向分布的不均匀。因此,整体结构形式复杂,对抗震要求高。首先,对结构的动力特性进行分析研究。在此基础上,使用振型分解反应谱法和FNA动力时程法对该结构的地震反应进行多维分析。接着,对安装非线性液体粘滞阻尼器(NFVDs)结构进行动力时程分析,以评价NFVDs对该结构的多维减震性能。通过大量的计算分析与比较,综合出了许多有益的结论与建议,为该实际工程或类似工程的减震设计提供参考依据。
Taking the Ningxia TV Tower(NXTVT) as an example case of composite tube structure,the three-dimensional(3D) finite element model of NXTVT was established by resorting to SAP2000 software.The shape of NXTVT resembles a vase of small bottom,large top,and slender-middle-waist.Likewise,its floors are arranged discontinuously,thus leading to the uneven distribution of structural mass and stiffness.Hence,there is a need of high demand of seismic performance in the design of the structure.The dynamic characteristics of the structure were analyzed and investigated.Based on this,the multi-dimensional seismic responses of the structure under the operating base earthquake(OBE) with a return period of 50 years were analyzed by use of both the response spectrum method and fast nonlinear analysis(FNA) time history method.Then,the time history analysis of NXTVT with nonlinear fluid viscous dampers(NFVDs) was carried out to evaluate the seismic response mitigation performance of NFVDs for the structure under multi-dimensional earthquakes.Through extensive numerical analysis and comparisons,the conclusions obtained herein will be much useful for the design of NVFDs for NXTVT or similar projects under earthquakes.
Taking the Ningxia TV Tower(NXTVT) as an example case of composite tube structure,the three-dimensional(3D) finite element model of NXTVT was established by resorting to SAP2000 software.The shape of NXTVT resembles a vase of small bottom,large top,and slender-middle-waist.Likewise,its floors are arranged discontinuously,thus leading to the uneven distribution of structural mass and stiffness.Hence,there is a need of high demand of seismic performance in the design of the structure.The dynamic characteristics of the structure were analyzed and investigated.Based on this,the multi-dimensional seismic responses of the structure under the operating base earthquake(OBE) with a return period of 50 years were analyzed by use of both the response spectrum method and fast nonlinear analysis(FNA) time history method.Then,the time history analysis of NXTVT with nonlinear fluid viscous dampers(NFVDs) was carried out to evaluate the seismic response mitigation performance of NFVDs for the structure under multi-dimensional earthquakes.Through extensive numerical analysis and comparisons,the conclusions obtained herein will be much useful for the design of NVFDs for NXTVT or similar projects under earthquakes.
引文
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[2]中华人民共和国行业标准.建筑结构荷载规范(GB 50009-2001)[S].北京:中国建筑工业出版社,2001.
[3]王建强,杜兴量,丁永刚.隔震层(偏心)对基础滑移隔震结构平-扭耦联地震反应的影响[J].振动与冲击2,010,29(4):22-26.
[4]王建强,丁永刚,李大望.上部结构(偏心)对基础滑移隔震结构平-扭耦联地震反应的影响[J].振动与冲击,2009,28(12):96-100.
[5]中华人民共和国行业标准.高层民用建筑钢结构技术规程(JGJ 99-98)[S].北京:中国建筑工业出版社,1998.
[6]北京金土木软件有限公司等.SAP2000中文版使用指南[M].北京:人民交通出版社,2006.
[7]Lu X L,Gong Z G,Wang D G,et al.The application of anew structural control concept for tall building with largepodium structure[J].Engineering Structure,2007,29:1833-1844.
[8]陈永祁,杜义欣.液体粘滞阻尼器在结构工程中的最新进展[J].工程抗震与加固改造,2006,28(3):65-72.
[9]张微敬,钱稼茹,沈顺高.北京A380机库采用粘滞阻尼器的减振控制分析[J].建筑结构学报,2009,30(2):1-6.
[10]Symans M D,Charney F A.Energy dissipation systems forseismic applications:current practice and recentdevelopments[J].Journal of Structure Engineering,ASCE2008,134(3):3-19.
[11]薛彦涛,韩雪.设置非线性粘滞阻尼器结构地震响应的时程分析[J].工程抗震与加固改造,2005,27(2):40-45.
[12]李爱群,张志强,徐庆阳.建筑减震粘滞阻尼器工程应用新进展[J].建筑结构,2006,36:88-93.
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