Analysis And Preventive Measures Of Impact Coefficient Of High-Pier Continuous Rigid Frame Bridge

With the full coverage of the national road network,at this stage,the implementation of alternative highway bridge implementation program,especially in the ability to overcome the outstanding construction methods,technical technology mature high pier large span prestressed concrete continuous rigid frame bridge At the same time with a good economic effect and short construction period,etc.,in the construction of our country has been favored.Especially in the macro background of the western development,this form of bridge in the western hilly areas have significant advantages,but in the current context,the lack of service on the core of the bridge core impact coefficient and its current impact analysis the study.In the whole cycle of the project,both the design,the construction stage and the service stage,the impact coefficient is related to the bridge dynamic characteristics,extremely important parameters.In the evaluation of the carrying capacity of the bridge during the service period of the bridge,the dynamic growth effect of the bridge is practically displayed in the form of impact coefficient.The influence of the impact coefficient is highlighted.This paper summarizes the calculation method of the impact coefficient,and points out the corresponding advantages and disadvantages respectively.On this basis,the finite element method of the vehicle-bridge interaction model is put forward as a tool to study the calculation method of the impact coefficient,The dynamic deflection curve of the bridge structure is obtained,and the impact coefficient of the active bridge is obtained according to the dynamic calculation method.This paper summarizes the existing vehicle-bridge interaction analysis methods at the present stage,and compares the methods of the whole process of the existing methods at the same time,and puts forward the advantages and disadvantages.Based on this,this paper proposes a better solution and compares it with the corresponding references to determine the feasibility and accuracy of this method.Then,based on the example of a project in Ningxia,this paper analyzes the 14 kinds of working conditions which are corresponding to the design of the bridge in the service phase of the bridge,and obtains the corresponding dynamic deflection The dynamic variation of the impact coefficient,the variation of the dynamic moment and the law of the impact coefficient,the law of the vertical acceleration response and the variation of the impact coefficient,the law of the vertical acceleration and the acceleration of the vehicle,and the parameters such as the bending moment,the vertical acceleration,the impact coefficient and the vertical acceleration of the vehicle.The vertical acceleration response of the vehicle.Through the above work,the design value of the impact coefficient of the bridge is obtained by using the value is not safe,and according to the law of the change of the impact coefficient,the corresponding measures are put forward,and the method of adding the liquid damping visc-Bridge service stage normal,smooth operation,for the national highway network operation to provide favorable protection.