Abstract: To study the seismic performance and vibration isolation method of multi-span curved continuous girder bridge,a finite element model is established for the multi-span curved continuous girder bridge with friction pendulum spherical bearings,and the dynamic characteristics and nonlinear time analysis is carried out.Results show that the longitudinal stiffness of the bridge model is weaker than the transverse stiffness,and the first-order vibration mode contributes more to the longitudinal seismic response of the bridge pier,and the vibration mode participation coefficient is 29.8%;the sixth-order vibration mode contributes more to the transverse seismic response of the bridge pier,and the vibration mode participation coefficient is 20%;under the E1 earthquake,the friction pendulum spherical bearing can keep the bridge in elastic working condition,and the bearing deformation and expansion joint width meet the requirements,which proves the effectiveness of the selected and arranged friction pendulum spherical bearing;under the E2 earthquake,the maximum bending moment demand of the section of some piers is greater than the bending capacity of the section,but further strength tests were carried out on the piers,and they all meet the seismic demand.

Key words: multi-span continuous curve beam bridge, friction pendulum spherical bearing, seismic isolation design, seismic performance