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Study of Seismic Isolation Measures for MultiSpan Concrete Continuous Girder Bridge
Pages: 32-37
Year: Issue:  2
Journal: Bridge Construction

Keyword:  continuous girder bridgeseismic isolation measureseismic mitigation spherical bearingfriction pendulum bearingseismic responsedynamic analysisfinite element method;
Abstract: To take the proper seismic isolation measures for the fixed piers of multi-span concrete continuous girder bridge is an effective way to improve the piers subjected to the action of seismic force.In this paper,a six-span concrete continuous girder bridge was cited as an example and by means of the finite element software ANSYS,two kinds of the seismic isolation systems of the friction pendulum bearings and seismic mitigation spherical bearings respectively arranged on the intermediate piers of the bridge were calculated and analyzed and the laws of influences of the two kinds of the systems on the seismic responses of the bridge were studied.The results of the study indicate that the two kinds of the systems can effectively reduce the internal forces and displacement of the piers in the longitudinal direction of the bridge.In comparison with the seismic resistant system,the force conditions of the seismic isolation system are more reasonable and in consideration of the vertical bearing capacity and resilient stiffness of the bearings,the friction pendulum bearings have obvious advantage and it is therefore proposed that the pendulum bearings should be selected for such type of the bridges where the seismic isolation measures are required to be taken.
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