竖向振动对摆线滑道辊轴摩擦摆隔震性能影响

Disturbance from Vertical Oscillation to Seismic Isolation Behavior of RFPS System

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.