竖向振动对摆线滑道辊轴摩擦摆隔震性能影响
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摘要
根据多体动力学理论相对动能定理推求了摆线滑道RFPS辊轴式摩擦摆隔震系统动力反应分析计算公式,并考虑了竖向弹性振动的影响。分析与计算结果表明:RFPS辊轴式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;依靠重力可以使结构复位。依靠滑块与滑道接触面的滑动摩擦阻力可以消耗传入结构的能量。适当地选取摆线旋轮半径与滚动摩擦系数值,隔震效率可达90%左右。在通常实用的滚动摩擦系数范围内,当竖向层间刚度系数为水平层间刚度系数的10倍以上时,可以不考虑竖向振动对水平方向隔震效率的影响。
A theoretical analyzing approach about RFPS seismic isolation system on cycloid slide is derived.It starts from the relative kinematic energy theorem in multiply-body dynamics,including the effect of elastic vibration in the vertical direction.Computation results show that a RFPS system has the three kinds of necessary capabilities required for an effective isolation system.The relatively long vibration period provides the necessary isolation capability,the gravity provides the reposition capability,and the rolling friction forces at the contacting surface provides the energy dissipation capability.It is shown that the inter-storey drift,storey velocity and acceleration resulted from seismic action could be drastically decreased on buildings equipped with RFPS system.If an optimum combination of rotator radius and rolling friction coefficient is adopted,the seismic isolation effectiveness could be as high as 90%.It is found that increment in rolling friction coefficient will accompany with reduction in seismic isolation effectiveness.If the vertical inter-storey rigidity coefficient is 10 times more than the horizontal inter-storey rigidity coefficient,the affect of vertical vibration could be neglected for an practical range of rolling frictional coefficient.
A theoretical analyzing approach about RFPS seismic isolation system on cycloid slide is derived.It starts from the relative kinematic energy theorem in multiply-body dynamics,including the effect of elastic vibration in the vertical direction.Computation results show that a RFPS system has the three kinds of necessary capabilities required for an effective isolation system.The relatively long vibration period provides the necessary isolation capability,the gravity provides the reposition capability,and the rolling friction forces at the contacting surface provides the energy dissipation capability.It is shown that the inter-storey drift,storey velocity and acceleration resulted from seismic action could be drastically decreased on buildings equipped with RFPS system.If an optimum combination of rotator radius and rolling friction coefficient is adopted,the seismic isolation effectiveness could be as high as 90%.It is found that increment in rolling friction coefficient will accompany with reduction in seismic isolation effectiveness.If the vertical inter-storey rigidity coefficient is 10 times more than the horizontal inter-storey rigidity coefficient,the affect of vertical vibration could be neglected for an practical range of rolling frictional coefficient.
引文
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[2]Wang Yen-Po,Chung Lap-Loi,Liao,Wei Hsin.Sesmic response analysis of bridges isolated with friction pendulum bearings[J].Earthquake Engi-neering&Structural Dynamics,1998,27(10):1069-1093.
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[6]Tsopelas P,Constantinou MC,Kim Y S,Okamoto S.Experimental study of FPS system in bridge seismic isolation[J].Earthquake Engineering andStructural 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,周锡元,王东炜.摩擦摆系统振动性态的进一步分析[J].振动工程学报,2001,14(3):330-333.
[9]李大望,赵卓,等.摩擦系统稳态随机响应预测[J].世界地震工程,2000,16(3):101-104.
[10]Yuan Jian,ROSCHK E Paul.Equation of motion for novel friction pendulum system with dual rollers[J].Transactions of Nanjing University ofAeronautics&Astronautics,2005,22(4):276-280.
[11]葛楠,苏幼坡,王兴国,周锡元.圆弧滑道双辊轴摩擦摆隔震系统的研究[J].工程力学,2009,26(6):158-165.
[12]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 pendulum bearings[J].Earthquake Engi-neering&Structural Dynamics,1998,27(10):1069-1093.
[3]Jangid R S,Datta TK.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,Zayas V,Sesmic isolation retrofit of large historic buildings[J].Journal of structure engineering,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 MC,Kim Y S,Okamoto S.Experimental study of FPS system in bridge seismic isolation[J].Earthquake Engineering andStructural 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,周锡元,王东炜.摩擦摆系统振动性态的进一步分析[J].振动工程学报,2001,14(3):330-333.
[9]李大望,赵卓,等.摩擦系统稳态随机响应预测[J].世界地震工程,2000,16(3):101-104.
[10]Yuan Jian,ROSCHK E Paul.Equation of motion for novel friction pendulum system with dual rollers[J].Transactions of Nanjing University ofAeronautics&Astronautics,2005,22(4):276-280.
[11]葛楠,苏幼坡,王兴国,周锡元.圆弧滑道双辊轴摩擦摆隔震系统的研究[J].工程力学,2009,26(6):158-165.
[12]Johnson K L.Contact Mechanics[M].London:Cambridge University Press,1985.
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