基于地震动特性的悬挂减振结构性能
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摘要
分析了一栋已建悬挂建筑在不同地震动输入下的结构响应规律.首先,根据其特点,建立了相应的数值分析模型.其次,在3组远断层地震波和3组近断层地震波输入下,分析了地震动特性对悬挂结构减振效果的影响;最后,给出了阻尼器分布对减振效果的影响.分析结果表明:在远断层和近断层地震波作用下,存在最优的阻尼系数使得筒体的动力响应最小.虽然地震波频谱特性不同,但优化得到的最优阻尼系数差别不大.在近断层地震波作用下,主结构的动力响应较大,且减振效果相对较差.阻尼器连接悬挂楼面和主结构筒体时,能够较好地约束悬挂楼面的层间位移和相对于筒体的位移.近断层地震波作用下悬挂楼面的层间位移和相对于筒体位移比远断层地震波作用下大得多.当阻尼器的总量一定时,按三角形或悬挂楼面的基本振型布置阻尼器比均匀分布能取得更好的减振效果,且能够更好地抑制悬挂楼面的位移.
The influence of the earthquake motions on the responses of the suspended-floor building are evaluated.First,based on the structural features,its numerical model was built.Secondly,time history analyses were employed to evaluate the effect of characteristics of earthquake motions on the controlling results of the suspended-floor structures under near-fault and far-fault earthquakes.Finally,the influence of the locations of the dampers was addressed.Numerical results show that the optimum damping coefficient of dampers can be obtained to minimize dynamic responses of the core-tube under near-fault and far-fault earthquakes and the optimum values are nearly identical in spite of the different features of earthquake motions.Moreover,under near-fault earthquakes,dynamic responses of the core-tube are relatively large but the vibration-controlling effect is small.The relative displacement of suspended floors to the core-tube and the story drift of suspended floors can be well constrained when the dampers are used to link the suspended floor with the core-tube.However,the relative displacements of suspended floors under near-fault earthquakes are larger than those under far-fault earthquakes.If the total quantity of dampers is given,the triangle or basic-mode distribution patterns of dampers are better than the uniform distribution pattern,the former would be beneficial to better controlling effect and decrease relative displacements of suspended floors.
The influence of the earthquake motions on the responses of the suspended-floor building are evaluated.First,based on the structural features,its numerical model was built.Secondly,time history analyses were employed to evaluate the effect of characteristics of earthquake motions on the controlling results of the suspended-floor structures under near-fault and far-fault earthquakes.Finally,the influence of the locations of the dampers was addressed.Numerical results show that the optimum damping coefficient of dampers can be obtained to minimize dynamic responses of the core-tube under near-fault and far-fault earthquakes and the optimum values are nearly identical in spite of the different features of earthquake motions.Moreover,under near-fault earthquakes,dynamic responses of the core-tube are relatively large but the vibration-controlling effect is small.The relative displacement of suspended floors to the core-tube and the story drift of suspended floors can be well constrained when the dampers are used to link the suspended floor with the core-tube.However,the relative displacements of suspended floors under near-fault earthquakes are larger than those under far-fault earthquakes.If the total quantity of dampers is given,the triangle or basic-mode distribution patterns of dampers are better than the uniform distribution pattern,the former would be beneficial to better controlling effect and decrease relative displacements of suspended floors.
引文
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[9]Wang Chunlin,LüZhitao,Tu Yongming.Dynamic re-sponses of core-tubes with semi-flexible suspension sys-tems linked by viscoelastic dampers under earthquake excitation[J].Advances in Structural Engineering,2011,14(5):801-814.
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[12]王春林.高层建筑悬挂结构减振理论及试验研究[D].南京:东南大学土木工程学院,2009.
[13]Loh C H,Wan S,Liao W I.Effects of hysteretic model on seismic demands:consideration of near-fault ground motions[J].The Structural Design of Tall Buildings,2002,11(3):155-169.
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[2]刘郁馨,吕志涛.悬挂建筑框架结构弹性稳定性估算方法[J].工程力学,1997,14(4):29-37.Liu Yuxin,LüZhitao.Elastic stability analysis for frames in suspended buildings[J].Engineering Me-chanics,1997,14(4):29-37.(in Chinese)
[3]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 vi-bration absorption control system of suspension structure[J].Journal of Building Structures,1997,18(5):59-65.(in Chinese)
[4]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.
[5]Nakamura Y,Saruta M,Wada A,et al.Development of the core-suspended isolation system[J].Earthquake Engi-neering&Structural Dynamics,2011,40(4):429-447.
[6]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.Dynamic behavior and pa-rameter optimization of core-tube suspension structures[J].Journal of Southeast University:Natural Science Edition,2007,37(2):1-5.(in Chinese)
[7]王春林,吕志涛,吴京.半柔性悬挂结构体系的减振机理及其减振效果分析[J].土木工程学报,2008,41(1):48-54.Wang Chunlin,LüZhitao,Wu Jing.Analysis of the mechanism and efficiency of vibration-absorption for semi-flexible suspension systems[J].China Civil Engi-neering Journal,2008,41(1):48-54.(in Chinese)
[8]王春林,吕志涛,涂永明.半柔性悬挂结构体系的风振响应参数优化及阻尼控制[J].土木工程学报,2009,42(3):1-7.Wang Chunlin,LüZhitao,Tu Yongming.Damping control and parameter optimization of wind-induced re-sponses of semi-flexible suspension systems[J].China Civil Engineering Journal,2009,42(3):1-7.(in Chi-nese)
[9]Wang Chunlin,LüZhitao,Tu Yongming.Dynamic re-sponses of core-tubes with semi-flexible suspension sys-tems linked by viscoelastic dampers under earthquake excitation[J].Advances in Structural Engineering,2011,14(5):801-814.
[10]Goodno B J.Dynamic analysis of suspended-floor high-rise buildings using super-elements[R].Stanford,USA:Department of Civil Engineering of Stanford Uni-versity,1974.
[11]Islam S,Kwok J,Wu H.Seismic retrofit of a suspen-ded floor high-rise building using an energy dissipation system[R].ATC-17-2Case studies:Mid-Rise and High-Rise Buildings,2002:9-18.
[12]王春林.高层建筑悬挂结构减振理论及试验研究[D].南京:东南大学土木工程学院,2009.
[13]Loh C H,Wan S,Liao W I.Effects of hysteretic model on seismic demands:consideration of near-fault ground motions[J].The Structural Design of Tall Buildings,2002,11(3):155-169.
[14]杨迪雄,赵岩,李刚.近断层地震动运动特征对长周期结构地震响应的影响分析[J].防灾减灾工程学报,2007,27(2):133-140.Yang Dixiong,Zhao Yan,Li Gang.Influence analysis of motion characteristics of near-fault ground motions on seismic response of long-period structures[J].Journal of Disaster Prevention and Mitigation Engi-neering,2007,27(2):133-140.(in Chinese)
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