变摩擦-摩擦摆支座减震机理及减震效果有限元分析
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摘要
将传统摩擦摆支座的球形滑面划分为n个圆环区域,研发一种新型变摩擦-摩擦摆支座,通过在不同环面上铺设不同材料从而实现摩擦系数的变化;通过理论及数值方法分析变摩擦-摩擦摆支座的减震机理,并探讨n变化时支座减震机理的变化规律;将n=6的新型变摩擦-摩擦摆支座应用到K8型单层球面网壳结构中,研究变摩擦-摩擦摆支座网壳结构的抗震性能,并分析传统及新型变摩擦-摩擦摆支座结构减震效果的差别。与传统摩擦摆支座相比,变摩擦-摩擦摆支座刚度和阻尼具有良好的自适应特性,并且随着n的增大,支座的自适应特性逐渐增强;变摩擦-摩擦摆支座单层球面网壳结构具有良好的抗震性能,与传统摩擦摆支座网壳结构相比,变摩擦-摩擦摆支座结构的减震效果更优。
The spherical sliding surface of the traditional friction pendulum bearing( FPB) is divided into n circular sliding surfaces with laying different materials,which leads to different friction coefficients when the slider contacts with different materials. The vibration reduction mechanism of VF-FPB is researched by the theoretical and numerical methods, and the change rules of vibration reduction mechanism are discussed for different values of n. When the VF-FPBs are installed into a K8 single-layer latticed shell,the seismic performance of this structure is studied,and the difference of vibration reduction effect of FPBs and VF-FPBs is discussed by finite element analysis method. The results show that the stiffness and damping of VF-FPBs have good adaptive characteristics compared with the traditional FPB,and this characteristics increase with the increase of n. Compared with the traditional FPB,this K8 single-layer latticed shell with VF-FPBs has good seismic performance,and the vibration reduction mechanism of VF-FPB is much better.
The spherical sliding surface of the traditional friction pendulum bearing( FPB) is divided into n circular sliding surfaces with laying different materials,which leads to different friction coefficients when the slider contacts with different materials. The vibration reduction mechanism of VF-FPB is researched by the theoretical and numerical methods, and the change rules of vibration reduction mechanism are discussed for different values of n. When the VF-FPBs are installed into a K8 single-layer latticed shell,the seismic performance of this structure is studied,and the difference of vibration reduction effect of FPBs and VF-FPBs is discussed by finite element analysis method. The results show that the stiffness and damping of VF-FPBs have good adaptive characteristics compared with the traditional FPB,and this characteristics increase with the increase of n. Compared with the traditional FPB,this K8 single-layer latticed shell with VF-FPBs has good seismic performance,and the vibration reduction mechanism of VF-FPB is much better.
引文
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[2]TSAI C S.Finite element formulations for friction pendulum seismic isolation bearings[J].International journal for numerical methods in engineering,1997,40(1):29-49.
[3]石志晓,李大望,沙卫芳.摩擦摆隔震结构地震反应谱的计算分析[J].世界地震工程,2004,20(2):39-42.
[4]Earthquake Protection Systems(EPS).Technical characteristics of friction pendulum bearings[E].http://www.Earthquake protection.com/Technical Characteristicsof FPBearngs.pdf,2017.
[5]PRANESH M,SINHA R.VFPI:An isolation device for aseismic design[J].Earthquake engineering and structure dynamic,2000,29(5):603-627.
[6]PRANESH M,SINHA R.Behavior of torsionally coupled structures with variable frequency pendulum isolator[J].Journal of structural engineering,2004,130(7):1041-1054.
[7]TSAI C S,CHIANG T C,CHEN B J.Finite element formulations and theoretical study for variable curvature friction pendulum system[J].Engineering structures,2003,25(14):1719-1730.
[8]LU L Y,LEE T Y,YEH S W.Theory and experimental study for sliding isolators with variable curvature[J].Earthquake engineering and structural dynamics,2011,40(14):1609-1627.
[9]TSAI C S,CHEN W S,CHIANG T C,et al.Component and shaking table tests for full-scale multiple friction pendulum system[J].Earthquake engineering and structural dynamics,2006,35(13):1653-1675.
[10]KIM Y S,YUN C B.Seismic response characteristics of bridges using double concave friction pendulum bearings with tri-linear behavior[J].Engineering structures,2007,29(11):3082-3093.
[11]FENA D M,CONSTANTINOU M C.Spherical sliding isolation bearings with adaptive behavior:Theory[J].Earthquake engineering and structural dynamics,2008,37(2):163-183.
[12]FENA D M,CONSTANTINOU M C.Spherical sliding isolation bearings with adaptive behavior:Experimental verification[J].Earthquake engineering and structural dynamics,2008,37(2):185-205.
[13]BECKER T C,MAHIN S A.Correct treatment of rotation of sliding surfaces in a kinematic model of the triple friction pendulum bearing[J].Earthquake engineering and structural dynamics,2013,42(2):311-317.
[14]薛素铎,赵伟,李雄彦.摩擦摆支座在单层球面网壳结构中的隔震分析[J].世界地震工程,2007,23(2):41-45.
[15]薛素铎,赵伟,李雄彦.摩擦摆支座在单层球面网壳结构隔震控制中的参数分析[J].北京工业大学学报,2009,35(7):933-938.
[16]KIM Y C,XUE S D,ZHUANG P,et al.Seismic isolation analysis of FPS bearings in spatial lattice shell structures[J].Earthquake engineering and engineering vibration,2010,9(1):93-102.
[17]孔德文,范峰,支旭东.摩擦摆支座在K8型单层球面网壳结构中的隔震研究[J].哈尔滨工业大学学报,2015,47(12):9-15.
[18]孔德文,范峰,支旭东.三维地震作用下应用FPB单层球面网壳抗震性能[J].哈尔滨工业大学学报,2016,48(6):10-16.
[19]KONG D W,WANG L L,FAN F,et al.Seismic performance of column supporting single-layer reticulated domes with friction pendulum bearings[J].International journal of steel structures,2017,17(2):471-480.
[20]巫炜.摩擦摆隔震结构分析[D].北京:北京交通大学,2007.
[21]中国建筑科学研究院.建筑抗震设计规范:GB50011—2010[S].北京:中国建筑工业出版社,2010.
[22]中国建筑科学研究院.空间网格结构技术规程:JGJ7—2010[S].北京:中国建筑工业出版社,2010.