粘滞流体阻尼器对电视塔的风振响应控制
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摘要
以合肥电视塔为工程背景,探讨了粘滞流体阻尼器对高耸电视塔在强风作用下风振响应的振动控制.按照随机振动理论,仿真得到了作用在电视塔上的19维互相关的人造脉动风压时程样本曲线,并利用时程样本进行了电视塔的风振响应分析;建立了一种双模型的动力分析方法.对安置了粘滞流体阻尼器的合肥电视塔进行了控制分析;以上塔楼的风振响应为优化目标,对阻尼器的参数进行了优化设计.研究表明,电视塔的风振响应峰值超过了规范的容许值,设置了粘滞流体阻尼器后电视塔的风振响应均有明显的减小,阻尼器消耗了大量的结构能量,采用最优阻尼参数使上塔楼加速度峰值响应下降了43.4%.
Hefei TV tower is taken as an analytical case to examine the control method with fluid viscous damper under the wind load fluctuation.Firstly,according to the random vibration theory,the effect of fluctuating wind on the tower can be modeled as 19-dimensional correlated random process,and the wind-induced vibration analysis of tower subjected to dynamic wind load were studied.On the basis of the other's works,a bi-model dynamic model is proposed.Finally,a dynamic model is proposed to study the wind-induced vibration control analysis using viscous fluid dampers,and the optimal damper damping coefficient is obtained regarding the wind-induced response of upper turret as optimization objectives.Analysis results show that the maximum peak response of the tower under dynamic wind load is far beyond the allowable range of the code: the wind-induced responses and the wind vibration input energy of the tower are decreased greatly with fluid viscous damper,and the peak acceleration responses of the upper turret is reduced by 43.4%.
Hefei TV tower is taken as an analytical case to examine the control method with fluid viscous damper under the wind load fluctuation.Firstly,according to the random vibration theory,the effect of fluctuating wind on the tower can be modeled as 19-dimensional correlated random process,and the wind-induced vibration analysis of tower subjected to dynamic wind load were studied.On the basis of the other's works,a bi-model dynamic model is proposed.Finally,a dynamic model is proposed to study the wind-induced vibration control analysis using viscous fluid dampers,and the optimal damper damping coefficient is obtained regarding the wind-induced response of upper turret as optimization objectives.Analysis results show that the maximum peak response of the tower under dynamic wind load is far beyond the allowable range of the code: the wind-induced responses and the wind vibration input energy of the tower are decreased greatly with fluid viscous damper,and the peak acceleration responses of the upper turret is reduced by 43.4%.
引文
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[2]叶正强,李爱群,徐幼麟.工程结构粘滞流体阻尼器减振新技术及其应用[J].东南大学学报:自然科学版,2002,32(3):466-473.Ye Zhengqiang,Li Aiqun,Xu Youlin.Fluid viscousdamper technology and its engineering application forstructural vibration energy dissipation[J].Journal ofSoutheast University:Natural Science Edition,2002,32(3):466-473.(in Chinese)
[3]Soong T T,Spencer B F.Supplemental energy dissipa-tion:state-of-the art and state-of-the practice[J].EngSruct,2002,24(3):243-259.
[4]Dicleli M,Mehta A.Seismic performance of chevronbraced steel frames with and without viscous fluid damp-ers as a function of ground motion and damper charac-teristics[J].Journal of Constructional Steel Research,2007,63(8):1102-1115.
[5]周云,邓雪松,汤统壁,等,中国(内陆)耗能减震技术理论研究、应用的回顾与前瞻[J].工程抗震与加固改造,2006,28(6):1-15.Zhou Yun,Deng Xuesong,Tang Tongbi,et al.State ofthe art and prospect of energy dissipation technology inChina mainland[J].Earthquake Resistant Engineeringand Retrofitting,2006,28(6):1-15.(in Chinese)
[6]Xu Y L,Yang Z,Lu X L.Inelastic seismic response ofadjacent buildings linked by fluid dampers[J].Structur-al Engineering and Mechanics,2003,15(5):513-534.
[7]张志强,李爱群,徐幼麟,等.合肥电视塔结构模型的建立及其动力特性分析[J].建筑结构,2003,33(3):50-53.Zhang Zhiqiang,Li Aiqun,Xu Youlin,et al.The3D-dynamic finite element model established and dynamiccharacteristics analysis of Hefei TV Tower[J].Build-ing Structure,2003,33(3):50-53.(in Chinese)
[8]Shinozuka M,Deodatis G.Simulation of stochasticprocesses by spectral representation[J].Applied Me-chanics Review,1991,44(4):191-203.(in Chinese)
[9]张志强.合肥电视塔风振及地震响应的振动控制研究[D].东南大学土木工程学院,2003.
[10]Xu Y L,Qu W L,Chen ZH.Control of wind-excitedtruss tower using semiactive friction damper[J].Jour-nal of Structural Engineering,2001,127(8):861-868.
[11]Xu Y L,Chen Z H,Qu W L.Dynamic analysis ofwind-excited truss tower with friction dampers[J].Computers and Structures,2001,79(32):2817-2831.
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