A comparative study on aseismic performance of bearings for multi-span bridge is carried out. Several leading bridge bearings, such as the LRB (Laminated Rubber Bearing) system, the P-F(Pure-Friction) system, the R-FBI(Resilient-Friction Base Isolation) system and the EDF(Eletricite De France) system are considered. Several sensitivity analyses for variations in natural period, friction coefficient are performed. The maximum responses of the center pier, namley the displacement of deck, the deformation of bridge bearing, the shear force and the bending moment of pier are obtained by using the accelerogram of the N00W component of El Centro earthquake(1940).
The displacement of deck and the deformation of bridge bearings decrease as natural period decrease and as friction coefficient increase. On the other hand, the shear force and the bending moment of pier increase. The displacement of the R-FBI system is smaller than that of the P-F system, the EDF system and the LRB system. The moment of the LRB system is smaller than that of the EDF system, the P-F system and the R-FBI system.
