Study On Static And Dynamic Performance Remediation Of Multi-span Concrete Filled Steel Tube Arch Bridge

In recent years,the development of concrete-filled steel tubular arch bridges has developed rapidly.As an excellent steel-concrete composite structure,it has the characteristics of strong cross-over capability,mature construction,and elegant design.It has been increasingly applied to roads in China and becomes a common bridge type.With the advancement of science and technology and economic prosperity,concrete-filled steel tubular arch bridges have also developed in the direction of greater spans and more combinations.Early in the process of building concrete-filled steel tubular arch bridges,due to the lack of construction experience,uniform industry standards,construction technology and restrictions on construction technology,and increasing traffic volume,many steel-concrete-arched arch bridges began to suffer disease,so the power for concrete-filled steel tubular arch bridges The study of static characteristics has also become more and more abundant,providing a basis for reinforcement and transformation of steel-concrete-arched arch bridges.The main research contents and achievements of this article are as follows:(1)The current status of research on dynamic and static forces of concrete-filled steel tubular arch bridges’ at home and abroad and examples of reinforcement were investigated,and the research questions were proposed.(2)By analyzing the defects of a concrete-filled steel tubular arch bridge in China,it is concluded that the fundamental reason for the upward tilting of the bridge is that the tie rods and main beams of the bridge are contracted under the influence of temperature,which leads to the fly end of the bridge upturned.(3)Analyze the dynamic and static damages of the concrete-filled steel tubular arch bridge in 2009,and conclude that in 2009,the bridge was only considered in the static aspects of the bridge,resulting in the reinforcement of the bridge in 2009.The overall stiffness is reduced,resulting in power disease.(4)After comprehensive analysis of the concrete-filled steel tubular arch bridge,while taking into account the improvement of the bridge’s static performance,taking into account the improvement of the bridge’s dynamic performance,three types of bridge dynamic and static force performance improvement plans are proposed.After comparing all three aspects of the scheme,the recommended scheme was selected and the key parts of the bridge were further calculated.In summary,the CFST arch bridge as a bridge of flexible system,has the advantages of light weight,high strength,and strong resistance to deformation,and it is necessary to accurately analyze the root cause of the bridge disease during the performance improvement of its structure.In terms of statics,it is also necessary to study the dynamic performance of the bridge,taking into account the impact of the bridge’s dynamic performance on the effectiveness of the renovation.