Abstract：In order to reduce seismic damage effect of curved girder bridges with double supports, the seismic response mitigation control technique with liquid viscous dampers is presented. The spatial finite element model and dynamic simulation model of curved continuous girder bridge are established, and viscous dampers are set at the kinetic bearings of piers in tangent and radial orientations. Seismic mitigation effectiveness of active control, semi-active control and passive control for the bridge is calculated and analyzed with three-dimensional ground motion input. The results indicts that curved girder bridges have distinct characteristic of seismic coupling in longitudinal and transversal orientations. Three orientations of the ground motion must be input simultaneously and longitudinal and transversal dampers are set simultaneously when seismic mitigation responses are calculated. The viscous dampers can control internal forces of inside pier and outside pier to be close approximately. The three mitigation approaches can effectively reduce displacement of girder and internal force of fixed piers of curved girder bridge. The differences of seismic mitigation effectiveness and seismic response time histories are both less for the three mitigation approaches. Active control and semi-active control have no obvious advantage, and the passive control with viscous dampers can be widely applied in actual seismic design of curved girder bridge.
2012, Vol. 31 
