Seismic Analysis Of Curved Prestressed Concrete Bridge And Study Of Pounding Effect

The curve beam bridge has been widely applied in the domestic and foreign urbanoverpass and urban elevated bridge because it can well overcome the terrain constraints tosatisfy the continuity of the highway line overall with a smooth and fluent alignment.After theSan Fernando earthquake from the United States in1971two large interchange project ofmulti span curved girder bridge collapsed, many scholars began to pay attention to the seismicproblem of curve bridge, since the seismic research of curved bridge has made greatprogress.Taking Xi’an city some interchange auxiliary bridge as engineering background, onthe basis of past research,an prestressed concrete continuous curved girder bridge is analyzedby response spectrum analysis and nonlinear time history analysis method, and the impactresponse of seismic isolation measures on the displacement and internal force of structure isstudied.The main work of this paper are as follows:(1) Establish the bridge spatial finite element model with the structural analysis softwareMIDAS/Civil and analyzes the dynamic characteristics of the example bridge;(2) Analyze the response of the structure respectively by using the response spectrumand time history analysis method according to the most unfavorable earthquake wave inputangle to the bridge structure under the action of earthquake E1and E2, and the results of twoanalysis methods were made a comparison detailedly;(3) Summarizes the mechanical characteristics and numerical simulation methodcommonly of the seismic isolation devices used in bridge, and use the nonlinear time historyanalysis method to study the effects of isolation rubber bearing on curved bridge structureinternal force and displacement response.The results show that the curved beam bridge has the characteristic of the vibrationcoupling phenomenon, and multidirectional earthquake seismic effect should be considered inthe response analysis of curved bridge;under the action of earthquake E1, response spectrumanalysis of pier shaft force is lower than time history analysis income, but bending momentand shear force value are higher than the value obtained by the time history analysis method,overall, the response spectrum method is a partial negative;Time history analysis of structureresponse can be obtained at any moment, and the analysis result can better reflect theactual;Using the dissipation of high damping rubber can bear great seismic energy, and thehorizontal and vertical pier bottom maximum bending moment and maximum shear vibrationisolation rate has greater isolation rate, and can effectively reduce the pier top displacement inthe direction along the river.