竖向刚度对FPS滑移摩擦摆系统隔震性能影响研究  

Disturbance from Vertical Oscillation to Siesmic Isolation Behavior of FPS System

作　　者：葛楠[1] 苏幼坡[1] 王兴国[1] 周锡元[2] 

机构地区：[1]河北理工大学,河北省地震工程研究中心,河北唐山063009 [2]北京工业大学,北京100022

出　　处：《工程抗震与加固改造》2010年第4期20-25,37,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(50778061);河北理工大学科学研究基金(z200711)

摘　　要：根据多体动力学理论相对动能定理推求了FPS滑移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:FPS滑移摩擦摆具有隔震系统所必需的特性。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。适当地选取滑道半径与滚动摩擦系数值,隔震效率可达90%左右。当滑道半径为2m～3m、滑动摩擦系数为0.01左右时,隔震系统具有较好的消能效果与复位能力。在通常实用的滑动摩擦系数范围内,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果的影响。A theoretical analyzing approach about FPS seismic isolation system is derived.It starts from the relative kinematics energy theorem in multiply-body dynamics,including the effect of inter-storey rigidity coefficient in the vertical direction.Computation results show that a FPS 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 slipping friction forces at the contacting surface provides the energy dissipation capability.It is shown that the inter-storey drift resulted from seismic action could be drastically decreased on buildings equipped with FPS system.If an optimum combination of slide radius and slipping friction coefficient is adopted,the seismic isolation effectiveness could be as high as 88%.It is also shown that when slide radius is in the range of 2～3m and the rolling friction coefficient is about 0.01,the FPS system posses both good energy dissipation and good reposition capabilities.If the vertical inter-storey rigidity coefficient is 10 times more than the horizontal inter-storey rigidity coefficient,for an practical range of rolling frictional coefficient,the affect of vertical rigidity could be neglected.

关 键 词：双滑动面摩擦摆 上盘 动能定理 非线性微分方程 

分 类 号：TU352.12[建筑科学—结构工程]