Abstract:The simulation analysis of the seismic characteristics of curved bridges is of great significance to the isolation and damping of curved bridges. Based on the design characteristics of isolated curved bridges, a nonlinear horizontal spring unit was used to simulate the bidirectional nonlinearity of the lead rubber bearing. Using SAP2000, a strong earthquake was selected, and the characteristics of the curved bridge were considered. The vibration characteristics of the bridge were simulated and analyzed considering different earthquakes. The simulation results are as follows:In the inputting process of different seismic waves and peak accelerations, under small earthquakes, the horizontal stiffness of bearing was relatively large, and the structure was relatively stable; the horizontal stiffness of the bearing under large earthquakes was relatively small, and the restoring force-displacement hysteresis curve of the bearing was relatively large, which can dissipate the seismic input energy, thus effectively mitigating the seismic response and play the isolation effect.