| Earthquake brings to the bridge damage,especially in the subsequent secondary disasters caused incalculable loss to the country and people,so the research on earthquake resistance of the bridge is particularly important,and the simply supported beam and continuous beam bridge because of its strong applicability,advantages of simple structure,easy standardization,conducive to construction is widely used in small and medium span Bridges.This kind of bridge generally adopts plate rubber support.The traditional seismic design is to resist the seismic action by bearing the seismic force of the structure through the bridge piers.This design method has great limitations and its economy is not good.In order to improve the traditional seismic design concept,it is necessary to find a new type of seismic structure to meet the needs of modern bridge construction,that is,the use of bridge pier and abutment to bear the seismic force.Therefore,this paper takes a small and medium span continuous girder bridge as the research object,uses the dynamic time history method to analyze the seismic response of the bridge along the bridge direction,to study the influence of different parameter changes on the synergistic seismic resistance of the pier.The specific work contents and conclusions are as follows:1、Through consulting a large number of materials about the damage of Bridges in the earthquake,this paper summarizes and briefly introduces the main forms of the damage of Bridges in the earthquake,and expounds the reasons for the damage of Bridges.2、On the basis of consulting a large number of literature and research results at home and abroad,the seismic response analysis method of bridge structure is selected reasonably,which provides theoretical support for the follow-up research work of this paper;Taking a continuous girder bridge(20×4)m as the research object,Midas/Civil software was used to establish the dynamic calculation model of the whole bridge,and the appropriate simulation methods were selected for the main girder,pier,abutment and support,etc.The natural vibration characteristics of the bridge are analyzed,and the frequency,period and mode characteristics of the first ten modes are given.The appropriate seismic wave was selected based on the reference of literature and model.3、With different bearing under the arrangement of bridge seismic response were studied,analysis the whole bridge using teflon slider bearing,to the shear force and bending moment on pier dishon bridge abutment,suitable to the force,along the bridge girder,pier beam relative to the displacement along the bridge to the influence of displacement,and the whole bridge plate rubber support at the time of the internal force and displacement were analyzed.4、Discusses the influences of different pad stiffness changes on pier bottom shear force and bending moment,abutment force,main girder displacement,support displacement,pier beam relative displacement,etc.,to obtain the optimal parameter values5、On the basis of research on pad stiffness,again to skateboard bearing friction coefficient under the change of bridge seismic response are studied,mainly studies the change of the friction coefficient of u to the shear force and bending moment on pier dishon bridge,bridge abutment to bearing along the bridge to the displacement,stress,girder bridge to the displacement,bridge pier beam relative to the displacement,etc.6、By the third chapter about the bearing arrangement,pad stiffness,the seismic response of the regularity study on the change of the friction coefficient,this chapter through the study of the seismic design of a practical bridge research,from the end of the pier shear bending moment,the abutment stress and displacement of main girder cross section,the relative displacement of the pier beam to consider and determine the bearing arrangement,pad stiffness value and the coefficient of friction. |
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