Seismic Isolation Performance of a Concrete Continuous Girder Bridge Based on High-Damped Rubber Bearings

AbstractA novel high-damped rubber bearing was applied to a continuous girder bridge. The flexuary capacity of piers and piles and the displacement demand of bearings were used as research objects. Simulation was performed by using a numerical model of the seismic isolation performance along the longitudinal direction of an irregular concrete continuous girder bridge. Various parameters and isolator layouts were optimized on the basis of FEM results to regularize and unify the seismic demands of the entire system. An unseating prevention device and a restrainer were used along the longitudinal direction to reduce the seismic displacement of the isolated girders. The design scheme of the pile foundation was also discussed. The effects of soil stiffness, nonlinearity of bearings, and collision of restrainer blocks were included in this analytical course. Numerical results reveal the excellent isolation performance of high-damped rubber bearings.