圆弧滑道偏心辊轴摩擦摆隔震性能的分析研究
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摘要
根据动能定理及滚动摩擦耗能原理推求了圆弧滑道偏心辊轴摩擦摆隔震系统动力反应分析计算公式。辊轴放置在具有内凹圆弧曲线形状的上、下盘滑道中间,与滑道之间为非协调接触,形成偏心辊轴式摩擦摆。分析与计算结果表明,这种摩擦摆具有隔震系统所必需特性:较长的自振周期使其具有必要的隔震能力;依靠结构重力可以使其复位;依靠滚动摩擦的作用,可以消耗传入上部结构的地震能量。设置辊轴摩擦隔震系统之后,能大幅减少结构地震动力反应的层间位移。适当地选取圆弧滑道半径或辊轴偏心距与滚动摩擦系数值,隔震效果可达90%左右。当圆弧滑道半径为2~3 m或辊轴偏心距为3 cm,滚动摩擦系数小于0.01时,隔震系统具有较好的消能效果与复位能力。
A theoretical analyzing approach about ERFPS(Eccentric Rolling Friction Pendulum System) is presented.It starts from formulation of the governing equation according to relative kinematics energy theorem in multiply body dynamics.This system consists of an eccentric roller which is placed in vicinity of two circular concave curve slides to form non-indented contacts.Computation results show that it has the three kinds of necessary capabilities required for an effective isolation system.The relatively long vibration period provides the seismic isolation capability,the gravity provides the reposition capability,and the rolling friction forces at contacting surface on top and bottom plate respectively,provides energy dissipation capability.It is shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with ERFPS system.If an optimum combination of cross-section eccentricity or slide radius and rolling friction coefficient is adopted,the seismic isolation efficiency could be as high as 90%.It is also shown that when eccentricity is about 3 cm or slide radius is in the range of 2～3 m and rolling friction coefficient is less than 0.01,ERFPS system exhibits both good energy dissipation capability and good reposition capability.
A theoretical analyzing approach about ERFPS(Eccentric Rolling Friction Pendulum System) is presented.It starts from formulation of the governing equation according to relative kinematics energy theorem in multiply body dynamics.This system consists of an eccentric roller which is placed in vicinity of two circular concave curve slides to form non-indented contacts.Computation results show that it has the three kinds of necessary capabilities required for an effective isolation system.The relatively long vibration period provides the seismic isolation capability,the gravity provides the reposition capability,and the rolling friction forces at contacting surface on top and bottom plate respectively,provides energy dissipation capability.It is shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with ERFPS system.If an optimum combination of cross-section eccentricity or slide radius and rolling friction coefficient is adopted,the seismic isolation efficiency could be as high as 90%.It is also shown that when eccentricity is about 3 cm or slide radius is in the range of 2～3 m and rolling friction coefficient is less than 0.01,ERFPS system exhibits both good energy dissipation capability and good reposition capability.
引文
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[7]周锡元,阎维明,杨润林.建筑结构的震动、减振和振动控制[J].建筑结构学报,2002,23(2):2-11.
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[9]Johnson K L.Contact Mechanics[M].London:Cambridge University Press,1985.
[2]Wang Yen-Po,Chung Lap-Loi,Liao Wei Hsin.Sesmic Response Analysis of Bridges Isolated with Friction PendulumBearings[J].Earthquake Engineering&Structural Dynamics,1998,27(10):1069-1093.
[3]Jangid R S,Datta T K.Seimic Behaviour of Base Isolated Buildings:A State of the Art Rview[J].Structures and Buildings,1995,110(2):186-202.
[4]Mokha A S,Amin N,Constantinou M C,et al.Sesmic Isolation Retrofit of Large Historic Buildings[J].Journal of structureengineering,ASCE,1996,122(3):298-308.
[5]Hwang J S.Evaluation of Equivalent Linear Analysis Methods of Bridge Isolation[J].Journal of Strueture Engineering,ASCE,1996,122(8):972-976.
[6]Tsopelas P,Constantinou M C,Kim Y S,et al.Experimental Study of FPS System in Bridge Seismic Isolation[J].EarthquakeEngineering and Structural Dynamics,1996,25:65-78.
[7]周锡元,阎维明,杨润林.建筑结构的震动、减振和振动控制[J].建筑结构学报,2002,23(2):2-11.
[8]李大望,赵卓.摩擦系统稳态随机响应预测[J].世界地震工程,2000,16(3):101-104.
[9]Johnson K L.Contact Mechanics[M].London:Cambridge University Press,1985.
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