Study On The Construction Quality Of Prestressed Concrete Continuous Beam Bridge

Prestressed concrete continuous beam bridge is widely used because of its superior structural system.Prestressed concrete continuous beam bridge mostly uses the cantilever method,During the process of bridge construction,Deformation and internal force of the bridge structure will be changed,To ensure the quality of construction, make the bridge linear and internal force meet the design requirements,the analysis of factors affecting the construction quality of the the bridge is necessary.Therefore, the numerical analysis is important in the bridge construction stage, The correct simulation not only can analyze the bridge construction internal forces theoretically, but also provide some references for engineering design and construction.The construction quality of prestressed concrete continuous beam bridge is affected by many factors, mainly including lack of uniformity in design and construction, influence of calculation model, influence of box girders temperature stress, influence of prestress loss, influence of shrinkage and creep, influence on the mechanical properties of concrete. This paper mainly analyses the influence of prestress loss and shrinkage and creep of concrete. The followings are the specific jobs:(1) The development process of prestressed concrete continuous beam bridge, bridge structure, stress characteristics and the latest progress of modern prestressed concrete bridge structure is introduced in this thesis.(2) The method to control the quality of construction process is introduced, And the construction quality judgment standard is proposed.(3) The paper takes the Chuan Chang He Bridge which locates at YanChen as engineering background, accord to the feature of force and construction of the prestressed concrete continuous beam bridge, analyzing the structure of the whole construction process by using bridge professional analysis software Midas/Civil.(4) Through the research on the structure model, The impact on the deformation and internal force of the prestressed error and the shrinkage and creep of concrete is studied by the example.