设置黏滞阻尼器的悬挂减振结构振动台试验研究
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摘要
通过对设置黏滞流体阻尼器的悬挂结构进行地震模拟振动台试验,分析了主结构与悬挂楼面的质量比、连接方式以及阻尼器分布对悬挂结构模型的频率、阻尼比和结构响应的影响。试验结果表明:与刚性杆连接的常规悬挂结构相比,采用阻尼器连接主结构和悬挂楼面,可改变结构频率,提高结构振型阻尼比,且模型前3阶振型主要表现为悬挂楼面剪切变形;悬挂减振结构主结构的位移峰值响应小于常规悬挂结构,略小于无连接的自由悬挂结构;当悬挂楼段质量较大时,减振效果更好;与自由悬挂结构相比,阻尼器连接的悬挂减振结构能较好地抑制悬挂楼面相对于主结构的位移和悬挂楼面的层间位移;当悬挂楼面侧向刚度较小时,阻尼器均匀布置比集中布置能更好地控制悬挂楼面的相对位移。
A shaking table experiment of suspended-floor structures equipped with fluid viscous dampers has been conducted in this paper.The effects of link types and the mass ratios between the primary structure and suspended floors and distribution patterns of dampers on responses of suspended-floor structure models were verified.These responses included the frequency,the mode-damping and maximum displacements of suspended-floor structures.Test results show that the frequencies and the mode damping of suspended-floor structures installed with dampers are adjusted and the first three modes are mainly influenced by the shear drift of suspended floors compared with traditional suspended-floor structures with rigid-bar links.Maximum displacements of the primary structure's top floor of the suspended-floor structure with dampers are smaller than the traditional suspended-floor structure and slightly smaller than the free suspended-floor structure without links.Moreover,the relative larger mass of the suspended segment is helpful to control the primary structure's dynamic responses.Besides,suspended-floor structures with dampers can effectively control the displacement of suspended floors relative to the primary structure and story drifts of suspended floors compared with free suspended-floor structures.When the lateral stiffness of suspended floors is relatively little,the uniform distribution of dampers is more effective to control the relative displacements of suspended floors than the congregating distribution of dampers.
A shaking table experiment of suspended-floor structures equipped with fluid viscous dampers has been conducted in this paper.The effects of link types and the mass ratios between the primary structure and suspended floors and distribution patterns of dampers on responses of suspended-floor structure models were verified.These responses included the frequency,the mode-damping and maximum displacements of suspended-floor structures.Test results show that the frequencies and the mode damping of suspended-floor structures installed with dampers are adjusted and the first three modes are mainly influenced by the shear drift of suspended floors compared with traditional suspended-floor structures with rigid-bar links.Maximum displacements of the primary structure's top floor of the suspended-floor structure with dampers are smaller than the traditional suspended-floor structure and slightly smaller than the free suspended-floor structure without links.Moreover,the relative larger mass of the suspended segment is helpful to control the primary structure's dynamic responses.Besides,suspended-floor structures with dampers can effectively control the displacement of suspended floors relative to the primary structure and story drifts of suspended floors compared with free suspended-floor structures.When the lateral stiffness of suspended floors is relatively little,the uniform distribution of dampers is more effective to control the relative displacements of suspended floors than the congregating distribution of dampers.
引文
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[3]Zhang Y H,Liang Q Z.Asynchronous driving principleand its application to vibration control[J].EarthquakeEngineering and Structural Dynamics,2000,29(2):259-270.
[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,QINRong.Study on characteristics of seismic response anddamping control for mega-frame tube with partialsuspension systems[J].Earthquake Engineering andEngineering Vibration,2002,22(4):133-138.(inChinese))
[5]Wang C L,LüZ T,Tu Y M.Dynamic responses ofcore-tubes with semi-flexible suspension systems linkedby viscoelastic dampers under earthquake excitation[J].Advances in Structural Engineering,2011,14(5):801-814.
[6]姚振纲,刘祖华.建筑结构试验[M].上海:同济大学出版社,1996:206-212.
[7]张晖,朱伯龙,苏少军.悬挂结构层间减震控制系统试验及分析[J].建筑结构学报,1997,18(5):59-65.(ZHANG Hui,ZHU Bolong,SU Shaojun.Research on vibration absorption control system ofsuspension structure[J].Journal of BuildingStructures,1997,18(5):59-65.(in Chinese))
[8]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.(Zhou Jian,Wu Xiaobo.A study of model-frequency behavior ofcore-wall suspension structures[J].EngineeringMechanics,2005,22(1):75-81.(in Chinese))
[9]曹万林,卢智成,张建伟,常卫华,赵长军.核心筒部分悬挂结构振动台试验及分析[J].土木工程学报,2007,40(3):40-44.(Cao Wanlin,Lu Zhicheng,Zhang Jianwei,Chang Weihua,Zhao Changjun.Shaking table test and analysis of core-tube partialsuspension structures[J].China Civil EngineeringJournal,2007,40(3):40-44.(in Chinese))
[10]Nakamura Y,Saruta M,Wada A,et al.Developmentof the core-suspended isolation system[J].EarthquakeEngineering&Structural Dynamics,2011,40(4):429-447.
[11]王春林,吕志涛.核筒悬挂结构的动力特性及参数优化[J].东南大学学报:自然科学版,2007,37(2):1-5.(Wang Chunlin,LüZhitao.Dynamicbehavior and parameter optimization of core-tubesuspension structures[J].Journal of SoutheastUniversity:Natural Science Edition,2007,37(2):1-5.(in Chinese))
[12]王春林,吕志涛,吴京.半柔性悬挂减振结构体系地震反应分析[J].建筑结构学报,2008,29(6):107-112.(WANG Chunlin,LZhitao,WU Jing.Seismic response of semi-flexible suspension vibration-absorption structures[J].Journal of BuildingStructures,2008,29(6):107-112.(in Chinese))
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