Construction Monitoring And Control To Five-span Continuous Rigid Frame Bridge Of Wenzhou-Fuzhou High-speed Railway

In recent years, prestressed concrete continuous rigid frame bridge has been growing up rapidly as a kind of long span bridge style. It almost has become the first selective bridge style when the main span is in the range from 100m to 300m, not only for the highway but also for the railway. During the cantilever construction of the prestressed concrete continuous rigid frame bridge, the beam axis shape of formed blocks can not be adjusted in lateral construction stages. Therefore, to ensure the closure of bridge successfully, the internal force at completion stage controlled in allowable range and the axis shape at completion stage satisfied the design requirement, the construction monitoring and control must be taken during the bridge construction.Combined actual construction practice with theory, the research is taken in this thesis. Baima River Bridge is chosen as project background, and finite element calculation model is built. By taking simulation analysis to the construction process of five-span prestressed concrete continuous rigid-frame, stress and deflection under each working condition are obtained, and the theoretic result is compared with the data obtained by on-site test. In theoretic calculation, the selection of calculation model and parameters is very important to reflect the reality of construction process of bridge. By removing non-stress strain of shrinkage and creep, the measured stress reflects the true stress state of structure successfully, and the stress control will be taken effectively to ensure the safty of construction.In addition, the wind-resistant behavior of the bridge is analyzed in this thesis. Analysis of aerostatic force on the Baima River Bridge is taken by the software of Midas/Civil in typical working conditions. Compared with the results calculated by Central South University, the calculation accuracy is proved, and adopting the fitful wind load to take Wind-resistant analysis is rational for the long span continuous rigid frame bridge of high stiffness.