Effects Of Vertical Stiffness Of Rubber Bearings On The Vertical Seismic Response Of Isolated High-Rise Building

A hybrid model is used to simulate the characteristics of the rubber bearing, which can accurately reflect the vertical stiffness properties. In this paper, the analysis method nonlinear seismic response of isolated high-rise building (IHRB) was described by a case study in high seismic intensity region. In addition, accurate simulation of horizontal mechanical characterisitcs of rubber bearing and influence analysis of different ratio of the tensile to compressive stiffness (RTCS) of rubber bearing were conducted. The results show that the RTCS have slight effect on the compressive stress of the rubber bearing, the axial force of the piers, and the acceleration at the top of the building, but has significant influence on the tensile stress of the rubber bearing and axial force of the frame column and cannot be neglected. Moreover, with the increase in the RTCS, the axial force of the frame column at each floor decreases. The larger RTCS will underestimates the axial force on the frame column under the rare earthquake. As the RTCS is reduced, the rubber bearing is less prone to tension, but the large RTCS will overestimates the tensile stress of the bearing under the rare earthquake. When the RTCS is smaller than 1:6, it has a slight effect on the veritcal seismic response of the IHRB.