双层球面网壳结构的阻尼替代杆件减振控制研究
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摘要
采用阻尼杆件替代双层网壳结构中的部分下弦杆件,既不改变原结构的网格形式,又对其进行有效的减振控制。在ANSYS软件中建立粘弹性阻尼杆件的数值模型,采用阻尼杆件对网壳部分下弦杆件进行替换,建立网壳减振结构数值模型;分别采用8种阻尼杆件替换方式对结构进行控制,进行结构的三维地震作用分析,在三种常用II类场地地震作用下考察替换杆件布局对结构控制效果的影响。研究表明:阻尼杆件布局方式对结构动力响应的控制效果有较大影响,合理布置阻尼替换杆件可以有效降低结构最大节点位移、最大节点加速度、最大杆件轴力等响应,控制效果可以达到20%～30%。
Replacing partial lower chords in double-layer spherical latticed shells with bar-type dampers can achieve good effect on vibration control without changing original structural layout of grid.The numerical analytical model of replaceable bar-type viscoelastic dampers is established firstly in ANSYS software.Then,the finite element analytical model of controlled double-layer spherical latticed shells is developed,in which some designated lower chords are replaced with the dampers.Eight layout schemes of the replaceable dampers are considered in the control shells.The influence of dampers' layout on the vibration control effect of the lattice shells under strong ground motions(II site category) is investigated through 3-D time history analysis.The investigated result indicates that the layout of the dampers has a significant influence on the dynamic responses of the lattice shells.With reasonable layout of replaceable bar-type dampers,structural dynamic responses,e.g.the maximum nodal displacement,the maximum nodal acceleration,the maximum axial force of components,etc.can be reduced by 20 to 30 percent.
Replacing partial lower chords in double-layer spherical latticed shells with bar-type dampers can achieve good effect on vibration control without changing original structural layout of grid.The numerical analytical model of replaceable bar-type viscoelastic dampers is established firstly in ANSYS software.Then,the finite element analytical model of controlled double-layer spherical latticed shells is developed,in which some designated lower chords are replaced with the dampers.Eight layout schemes of the replaceable dampers are considered in the control shells.The influence of dampers' layout on the vibration control effect of the lattice shells under strong ground motions(II site category) is investigated through 3-D time history analysis.The investigated result indicates that the layout of the dampers has a significant influence on the dynamic responses of the lattice shells.With reasonable layout of replaceable bar-type dampers,structural dynamic responses,e.g.the maximum nodal displacement,the maximum nodal acceleration,the maximum axial force of components,etc.can be reduced by 20 to 30 percent.
引文
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[2]Saka T,Taniguchi Y.Damage to spatial structures by the1995 Hyogoken-Nanbu earthquake in Japan[J].International Journal of Space Struc-tures 1997,(3/4):125-133.
[3]Housner G W,Bergman L A,Caughey T K,ChassiakosA G,ClausR O,Masri S F,Skelton R E,Soong T T,Spencer B F Jr,Yao T P.Struc-tural control:past,present,and future[J].Journal of Engineering Mechanics,ASCE,1997,123(9):897-971.
[4]全希坤,李宏男,曹勇.减震控制技术在大跨空间网壳结构中的研究与发展[J].沈阳建筑大学学报,2006,22(5):745-749.QUAN Xikun,LI Hongnan,CAO Yong.Study and development of earthquake mitigation control of long-span spatial reticulated shell structure[J].Journal of Shenyang Jianzhu University Natural Science,2006,22(5):745-749.
[5]周晓峰,陈福江,董石麟.粘弹性阻尼材料支座在网壳结构减震控制中性能研究[J].空间结构,2000,6(4):21-28.ZHOU Xiaofeng,CHEN Fujiang,DONG Shilin.Analysis on properties of viscoelastic bearing under the earthquake excitation[J].Space Struc-tures,2000,6(4):21-28.
[6]徐赵东,李爱群,叶继红.大跨空间网壳结构减震控制的研究与发展[J].振动与冲击,2005,24(3):59-61XU Zhaodong,LI Aiqun,YE Jihong.Study and development on earthquake mitigation control of long-span spatial reticulated shell structure[J].Journal of Vibration and Shock,2005,24(3):59-61
[7]叶继红,陈月明,沈世钊.TMD减震系统在网壳结构中的应用[J].哈尔滨建筑大学学报,2000,33(5):10-14YE Jihong,CHEN Yueming,SHEN Shizhao.Optimum design for reticulated shell structure-TMD systems subjected to seismic excitations[J].Jour-nal of Harbin University of Civil Engineering And Architecture,2000,33(5):10-14.
[8]Zhang Y G,Ren G Z.A practical method on seismic response controlled double layer cylindrical lattice shell with variable stiffness members[C]//IASS Symposium2001,Nagoya.
[9]Onoda J,Oh H U,Minesugi K.Semi-active vibration suppression of trussstructuresby ER fluid damper[C]//Structural Dynamicsand MaterialsConference,1996:1569-1577.
[10]瞿伟廉,徐幼麟.ER/MR智能阻尼器对空间网壳结构地震反应的半主动控制[J].地震工程与工程振动,2001,21(4):24-31QU Weilian,XU Youlin.Semi-active control for earthquake responses of reticulated shells with ER/MR smart dampers[J].Journal of EarthquakeEngineering and Engineering Vibration,2001,21(4):24-31
[11]秦乃兵,张毅刚,茹洋.采用新型阻尼杆的双层柱面网壳结构减震分析与实验研究[J].建筑结构学报,2005,26(6):108-11.QIN Naibing,ZHANG Yigang,RU Yang.Shaking table experimental study on earthquake resistance control of double-layer latticed cylindricalshell with new type damper elements[J].Journal of Building Structures,2005,26(6):108-11.
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