Seismic Response and Parameter Influence Analysis of Curved Girder Bridge with Laminated Rubber Bearings

The response of curved girder bridge is complicated during the earthquake.The upside bridge girders are often easily to pound with adjacent ones or abutments and even falling-off.The laminated rubber bearings usually slide on piers or abutments in earthquake,this behavior will significantly change the dynamic response of the bridge.In this paper,a curved girder bridge with laminated rubber bearings was taken for consideration and its multi-scale finite element model was established.The responses of bearings and the upper and lower part of bridge were analyzed by using nonlinear time history method.Based on the analysis,the impact behavior between the girder and abutment was simulated by dynamic explicit contact algorithm and the value of friction coefficient was varied to study the effects of pounding and friction on response of the bridge in the earthquake.The results indicate that,for the difference between vertical reaction force of bearings set inside and outside the curved bridge,the inside bearings slide more easily than the outside ones and the force state of outside pier is more complicated than that of inside pier one.The pounding effect reduces the bearing′s anti-sliding capacity and makes both the displacement at the end of the girder and internal force at the bottom of the pier larger.The bearing′s anti-sliding capacity strengthens significantly as the coefficient of friction improves.Both coefficient of friction and pounding effect have a great influence on the torsion moment of the piers.