双向圆弧滑道RFPS辊轴摩擦摆隔震性能研究

Research on seismic isolation behavior of RFPS system with bi-direction arc track

根据多体动力学虚位移原理推求了双向圆弧滑道RFPS辊轴式摩擦摆隔震系统动力反应分析计算公式.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人结构的能量.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2～3m、滚动摩擦系数为0.05左右时,隔震系统在水平面两个方向都具有较好的消能效果与复位能力;滚动摩擦系数增大引起层间位移增加.

A theoretical analyzing approach about RFPS seismic isolation system with saddle bearing is derived.It starts from the virtual displacement principal in multiply-body dynamics.Computation results show that the RFPS system has three kinds of necessary capability required for an effective isolation system,i.e.the relatively long natural 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 appropriate combination of slideway radius and rolling friction coefficient is adopted,the seismic isolation efficiency could be as high as 90％.It is also shown that when slideway radius is in the range of 2-3m and the rolling friction coefficient is about 0.05,the RFPS system exhibits both good energy dissipation and good reposition behaviors.It is found that increase in rolling friction coefficient will be accompanied with increase of interstory drift.