Seismic Isolation Bearing On the Comparative Analysis of the Seismic

Based on north south approach spans of Xiamen-zhangzhou cross-sea bridge by using the finite element nonlinear analysis method, the seismic impact is compared between lead-rubber bearing and pot rubber bearing on the long span box girder bridges in high-intensity areas. The results show that the lead-rubber bearing can increase the vibration period and displacement of main beam in earthquake, reduce the force of fixed piers. Compared with pot rubber bearing, adopting lead-rubber bearing can increase the end displacement of main grider by 20% to 200%, meanwhile decrease internal force for fixed piers by 36% to 80%. The isolation effect is obvious that lead-rubber bearings can reduce the pier force by increasing the displacement of main beam. The research results provide a reference for the same type of bridge seismic design.