Analyzing the compound seismic system consisting of RFPS system and dish spring

A theoretical analyzing approach about the compound seismic isolation system consisting of RFPS and dish spring is derived. It starts from Lagrange’ Equation in multiply-body dynamics, including the coupling effect of the level vibration and vertical vibration. Computation results show that this system has the necessary isolation capability and reposition capability in the both direction; the slipping friction forces at the contacting surface provides the energy dissipation capability. It is shown that when slide radius is in the range of 1∼2m and the slipping friction coefficient is about 0.01, the seismic isolation effectiveness could be as high as 88%, while the coupling effect in two directions is so small that it could be neglected and the dynamic responses could be calculated with respect to each of the individual direction for earthquake engineering.