核筒悬挂建筑结构体系的顺风向风致响应分析
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摘要
核筒悬挂建筑结构是一种新型的高层建筑结构体系,其风致响应的研究很少。模拟了B类地貌下的风速时程,并转化为作用在结构上的风荷载时程;利用有限元软件ANSYS建立了结构计算模型,进行了结构水平顺风向风振响应分析,并与悬挂非减振结构进行比较,给出了阻尼器参数优化结果。分析结果表明,在水平顺风向风荷载作用下,核筒悬挂减振结构与非减振结构相比顶部位移、加速度均有所下降。阻尼器刚度的合理选择,不仅可使核筒顶部的位移响应减小,还可有效地控制悬挂楼层层间相对位移;而阻尼器阻尼系数取一个较大值(如1×108N.s/m)就可达到较好的控制效果。核筒悬挂减振结构具有良好的应用前景,该文的研究工作为这种新型结构体系的实用抗风设计提供参考。
The Core-tube suspended structure is a novel kind of high-rise structural systems,while its wind-induced responses have not been studied systematically.The wind speed time-history in B class landscape is simulated.And then the wind speed time-history is transformed into wind load time-history acting on the building structure.The calculation model of a vibration-absorption suspended building is built with the finite element method software ANSYS.Then the wind-induced responses are calculated,which are compared with those of ordinary suspended structures.Consequently,the optimized values of parameters for damper connections are discussed.The results show that the displacement and acceleration responses of the top core-tube of a vibration-absorption suspended building under an along-wind load are less than those of an ordinary suspended building.The appropriate damper stiffness can not only reduce the displacement of the top core-tube,but also control the inter-story displacements of suspended floors effectively.And that an improved dynamic control of responses of a suspending building can be achieved with a relatively large damping coefficient,for instance,1×108N?s/m.The core-tube suspended structures have a good application prospect,and the present work may provide a wind-resistant design reference for this kind of structures.
The Core-tube suspended structure is a novel kind of high-rise structural systems,while its wind-induced responses have not been studied systematically.The wind speed time-history in B class landscape is simulated.And then the wind speed time-history is transformed into wind load time-history acting on the building structure.The calculation model of a vibration-absorption suspended building is built with the finite element method software ANSYS.Then the wind-induced responses are calculated,which are compared with those of ordinary suspended structures.Consequently,the optimized values of parameters for damper connections are discussed.The results show that the displacement and acceleration responses of the top core-tube of a vibration-absorption suspended building under an along-wind load are less than those of an ordinary suspended building.The appropriate damper stiffness can not only reduce the displacement of the top core-tube,but also control the inter-story displacements of suspended floors effectively.And that an improved dynamic control of responses of a suspending building can be achieved with a relatively large damping coefficient,for instance,1×108N?s/m.The core-tube suspended structures have a good application prospect,and the present work may provide a wind-resistant design reference for this kind of structures.
引文
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[2]涂文戈,邹银生.MTMD减震结构体系的频域分析[J].工程力学,2003,20(3):78―88.Tu Wenge,Zou Yinsheng.Analysis of multistory structures with MTMD in frequency domain[J].Engineering Mechanics,2003,20(3):78―88.(in Chinese)
[3]欧进萍,张微敬.高层建筑结构的风振阻尼控制分析与设计方法[J].建筑结构学报,2003,24(6):32―37.Ou Jinping,Zhang Weijing.Analysis and design method for wind-induced vibration passive damping control of tall building[J].Journal of Building Structure,2003,24(6):32―37.(in Chinese)
[4]邓志恒,秦荣.巨型框筒部分悬挂结构控制体系地震反应特性及阻尼控制研究[J].地震工程与工程振动,2002,22(4):133―138.Deng Zhiheng,Qin Rong.Study on characteristics of seismic response and damping control for mega-frame tube with partial suspension systems[J].Earthquake Engineering and Engineering Vibration,2002,22(4):133―138.(in Chinese)
[5]周坚,伍孝波.核筒悬挂结构体系自振特性研究[J].工程力学,2005,22(1):75―81,74.Zhou Jian,Wu Xiaobo.A study of model-frequency behavior of core-wall suspension structures[J].Engineering Mechanics,2005,22(1):75―81,74.(in Chinese)
[6]夏逸鸣,张韫美,赵惠麟.悬挂式层间减震结构地震反应的比较分析[J].工程力学,2000,17(6):73―81,52.Xia Yiming,Zhang Yunmei,Zhao Huilin.Comparative analysis of earthquake response of suspension structures with story vibration absorption apparatus[J].Engineering Mechanics,2000,17(6):73―81,52.(in Chinese)
[7]涂永明.CFRP索悬挂建筑结构静力和动力分析及研究[D].南京:东南大学,2005.Tu Yongming.Study on the static and dynamic mechanisms of CFRP cable suspended building structures[D].Nanjing:Southeast University,2005.(in Chinese)
[8]Zhang Y H,Liang Q Z.Asynchronous driving principle and its application to vibration control[J].Earthquake Engineering and Structural Dynamics,2000,29(2):259―270.
[9]张相庭.工程结构风荷载理论和抗风计算手册[M].上海:同济大学出版社,1990.Zhang Xiangting.Wind Load theory and wind-resistant calculation manual of engineering structure[M].Shanghai:Tongji University Press,1990.(in Chinese)
[10]黄本才.结构抗风分析原理及应用[M].上海:同济大学出版社,2000.Huang Bencai.Structural analysis theory and application of wind[M].Shanghai:Tongji University Press,2000.(in Chinese)
[11]Owen J S.The application of auto-regressive time series modeling for the time-frequency analysis of civil engineering structures[J].Engineering Structures,2001,23:521―536.
[12]舒新玲,周岱.风速时程AR模型及其快速实现[J].空间结构,2003,9(4):27―32.Shu Xinling,Zhou Dai.AR model of wind speed time series and its rapid implementation[J].Spatial Structures,2003,9(4):27―32.(in Chinese)
[13]Mario Di Paola.Digital simulation of wind field velocity[J].Journal of Wind Engineering and Industrial Aerodynamics,1998,74:91―109.
[14]王勖成.有限元法[M].北京:清华大学出版社,2003.Wang Xucheng.The finite element method[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[15]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170―174.Tian Yuji,Yang Qingshan.Analysis models and methods for structural seismic responses[J].Engineering Mechanics,2005,22(6):170―174.(in Chinese)
[16]田玉基,杨庆山.国家体育场屋盖结构风振响应的时域分析[J].工程力学,2009,26(6):95―99.Tian Yuji,Yang Qingshan.Wind-induced responses of Beijing national stadium using time history analysis method[J].Engineering Mechanics,2009,26(6):95―99.(in Chinese)
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