Analysis of LRB-DSB Three Dimensional Isolation System’s Isolating Effect

In order to study the isolating effect of the three dimensional laminated rubber bearings-dish spring bearing （LRB-DSB） isolation system, comprehensive analyses for its construction, mechanism, and design theory were performed. On the basis of these analyses, comparative studies of the vibration characteristics and the dynamic response under three dimensional seismic excitation of the three dimensional base of the isolated structure based on LRB-DSB, horizontal isolation structure based on the LRB, and general seismic structure were conducted. The results showed that, in comparison with the LRB horizontal isolation system, the vertical stiffnesses of the three dimensional LRB-DSB isolation systems are properly descended, and the vertical vibration period can be extended by 120%. The LRB isolation system demonstrates good horizontal isolation capacity, but has no vertical isolation effect; it may even amplify any vertical seismic action on the structure. The three dimensional LRB-DSB isolation system can suitably make up for these deficiencies by isolating both the horizontal and vertical effects well.