Mechanical Analysis And Consturction Control Of Prestressed Concrete Continuous Girder Bridge

The stress of the prestressed concrete continuous girder bridge is reasonable because of the furthest utilization of the compressive property of the concrete and the tensile property of the prestressed rebar.also, it has high degrees in saving materials, smoothy, and the comfort of driving.hence, this is a competitive scheme in the type selection of hundreds-meter span bridge.In this paper, we study the calculation and implementation of the construction control in all step based on a actual engineering construction. We first elaborate the development and the construction method of continuous prestressed concrete bridge, and illustrate the significance of the construction control briefly on this basis, and then, we analysis the object,principle, fundamental, calculation and analysis methods of the construction control. The objection of the construction control is to make the line font and internal state of the bridge up to the design requirement. To meet this objection, all kinds of factors in the construction should be take into account, such as structure parameter, construction technology, the errors of monitoring and model calculation, the management of construction, temperature and the concrete shrinkage and creep. On this basis, we build MIDAS finite element model to calculate and analysis the in the construction, finally obtain the data of stress and deformation in all stages which can make preparations for construction control. Then we illustrate the monitoring scheme of thefactors such as the internal stress and deformation in the construction. At last, we coMPare the results and the design value after the bridge is complete.We have proved that the internal stress and deformation of girder can be well managed with the construction control, the whole stage of the bridge construction is under control, all index such as structure progress well, this proves the correctness of the control method. The principles and methods in our paper can provide references to the later similar projects.