Abstract: This study analyzes three seismic isolation bearing devices to evaluate their effectiveness in the three-dimensional dynamic response of a box girder bridge and the complexities associated with their modeling. It examines energy dissipation mechanisms, including Natural Rubber Bearings (NRB), elastomeric bearings with High Damping Rubber (HDRB), and neoprene bearings with a Lead Core (LRB), to enhance seismic design performance and optimize the dimensions of this specific category of bridge structures. For this purpose, a three-dimensional finite element numerical model of a standard bridge is developed. Nonlinear dynamic analysis is conducted using models that represent the bilinear hysteretic behavior of the seismic isolation systems. The findings indicate that these isolators significantly influence the seismic response in the longitudinal direction and effectively reduce seismic demand on the bridge.
Keywords: Seismic isolation systems, box girder bridge, NRB, HDRB, LRB, Nonlinear dynamic analysis