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从理论上分析了干摩擦板-复位弹簧隔震系统的隔震性能,建立了设置隔震系统结构离散多自由度体系运动方程,并计算了一个设置隔震系统结构在地震作用下的动力反应。计算结果表明,应用干摩擦板-复位弹簧隔震系统以后,结构具有较长的自振周期,隔震效果明显,楼层最大位移增加但沿结构高度分布趋于均匀化,最大层间位移值大幅度减少;依靠弹簧能够复位;接触面上的滑移摩擦作用能消耗传入上部结构的地震能量。决定隔震系统效率的关键因素是接触面摩擦系数与复位弹簧的刚度系数;接触面滑移摩擦系数与复位弹簧系数均取较低的数值时,隔震效率可以达到90%左右。
The seismic isolation performance of the dry friction plate-return spring isolation system is theoretically analyzed. The equations of motion of the discrete multi-degree-of-freedom system with the isolation system are set up. The dynamic response of a structure with isolated seismic isolation system under earthquake action is calculated. . The calculated results show that the structure has a long period of natural vibration after the application of the dry friction plate-return spring isolation system, the effect of isolation is obvious, the maximum displacement of the floor increases but the distribution along the structure tends to be uniform, and the maximum inter-floor displacement Amplitude decreases; relying on the spring can reset; sliding friction on the contact surface can consume the energy transmitted to the superstructure. The key factor that determines the efficiency of isolation system is the coefficient of friction between the contact surface and the return spring. When the sliding friction coefficient of the contact surface and the coefficient of the return spring are both lower, the isolation efficiency can reach about 90%.