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根据动能定理及滚动摩擦耗能原理推求了一种圆弧滑道双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盘、下盘滑道中间,与滑道之间为非协调接触,形成辊轴式摩擦摆。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离能力;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2m―3m、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。
According to the kinetic energy theorem and the principle of rolling friction energy dissipation, a formula for calculating the dynamic response of a two-roller friction pendulum system with circular arc chute is deduced. The roller shaft is placed on the upper disc with the shape of a concave circular arc, and the middle of the lower disc chute is in non-coordinated contact with the chute to form a roller shaft type friction pendulum. Analysis and calculation results show that this kind of friction pendulum has the necessary characteristics of isolation system. Long period of natural vibration to make it with the necessary isolation ability; rely on structural gravity can make it reset; rely on the role of rolling friction, can consume the energy transmitted to the superstructure. After the roller friction isolation system is set up, the interlayer displacement of structural dynamic response can be greatly reduced. Appropriate to select the radius of the arc slide and rolling friction coefficient, the isolation effect of up to 90%. When the arc slide radius is 2m-3m, rolling friction coefficient is less than 0.01, the isolation system has better energy dissipation and reset capability.