Study On The Collision Effect Of Different Kinds Of Materials Between Beams Under Earthquake Excitation

It is well known that the bridge is the important part of transit lines,once the bridge was damaged in the earthquake,it will have a great impact.In recent years,the collision effect between adjacent bridges has been highlighted under the excitation of earthquake,but the research on the collision effect is also deficient,and the adjacent span beams are mostly using different kind of materials.Based on this,this paper makes the collision effect of different kinds of materials between beams under earthquake excitation as the research object,and take research methods of bridge collision model test,in the meanwhile,the ANSYS finite element software is also implied to analyze.Then this paper is mainly researching the value of the collision parameters in the implicit dynamic analysis method and the influence factors and values of the impact stiffness of each model in the simplified analysis method.The main contents and achievements can be summarized as follows:(1)This paper has summarized the research status of bridge earthquake damage and bridge collision problem in previous major earthquakes,and summed up the analysis method of bridge structure collision,including the simplified analysis method and implicit dynamic analysis method,which mainly introduced several collision models of the contact element method contained in the simplified analysis method.(2)Adjacent combination has taken the steel box girder and concrete beam as an example,and this paper has carried out a bridge collision model test design,then simplified the design of the component section through the stiffness equivalence principle,next processed and installed the model,and final to achieve the completion of the installation of test equipment.(3)In this paper,the collision parameters of the simplified analysis method,including the coefficient of recovery and the impact stiffness of each model,have been studied based on the model test data,then the influence factors of collision parameters and the method of taking value also have been studied.(4)In this paper,ANSYS software has been used to model the experiment,the time history principle has been analyzed,the influence of the ratio coefficient of contact stiffness on the peak of impact force also has been analyzed,and the collision parameter of the implicit dynamic analysis method would be obtained by combining the model test data.(5)In this paper,based on the model test data,the method of value of the collision stiffness of each model has been obtained,and the girder collision has been analyzed by the implicit dynamic analysis method,and final the ratio coefficient of contact stiffness has been obtained from 0.001 to 0.01.