| During the past two decades, the prestressed concrete continuous rigid frame bridge has been developed rapidly. It is essential to execute the bridge construction control, to ensure the quality and safety of the construction, furthermore, to guarantee the actual state of continuous rigid frame bridge approaching to the designed state to the most extent. This thesis took Guo Jundu Fujiang Great Bridge as the engineering background, analyzed the mechanical state of the whole superstructure construction process, proposed a reasonable controlling program on the construction, and established a comprehensive monitoring system. The main work done is as follows:1. On the brief introduction of the features and controlling methods in the construction of the prestressed continuous rigid frame bridge, this thesis focused on the structural analysis and construction monitoring methods, and put forth a reasonable plan of construction control for the bridge. Therefore it provided a theoretical foundation for the construction of the program.2. The finite element software was used to set up a simulated calculation model, and the sequential calculation method was adopted to precede a simulated analysis and calculation on the construction of the main beam of the Guojundu Fujiang Great Bridge. It provided us with the change in stress and displacement in theory in the process of construction effectively and also provided a theory basis for the implementation of the construction control.3. The monitoring control was carried out on the construction of the Fujiang Great Bridge. Various factors were fully considered and analyzed, and moreover, the adjustment and control of the alignment and stress on the bridge were implemented by means of calculating, monitoring and forecasting.4. By comparing the measured data and theoretical calculated figure, it was obvious that:the linear deviation between the measured and the calculated was within±9mm during, the every phases of the whole construction; the deviation between the measured stress and the theoretical one of every cross section of the main beam was within 1MPa, and the maximum compressive stress was no more than 15.1MPa. No tensile stress occured, and the structure was secure during the entire construction process. It was in good agreement between the measured data and the calculated one of the deflection and the stress. Finally, the purpose of construction control was attained.The result of this study provides a theoretical basis for the construction control of the large-span prestressed concrete continuous rigid frame bridge, and it also possesses certain referential value for the construction control of similar bridges afterwards. |
