Study On Construction Control Of Concrete Filled Steel Tube Bowstring Arch Bridge

Concrete filled steel tube bowstring arch bridge was one form of the arch bridge, which combined girder and arch two basic structure together, bowstring arch bridge could give full play of the two structure’s potential. Bowstring arch bridge had all the advantages of an arch bridge, such as large span ability, high space utilization, beautiful modeling and so on. In addition, the foot of the bowstring arch bridge would not generate horizontal thrust, so the requirements of the foundation bearing capacity is relatively low. Concrete filled steel tube bowstring arch bridge was often used in bridge constructions, the research on concrete filled steel tube bowstring arch bridge was relatively few, therefore, a certain bowstring arch bridge was taken as the engineering background, and the following works were carried out:1. The basic theory and research status of bridge construction control were discussed. Deformation and stress control of the concrete filled steel tube bowstring arch bridge were carried out. The fabrication geometry of the arch rib and the timing of the construction of prestressed reinforcement were determined to ensure the safety of the bridge.2. Four kinds of method were used to calculate the cable force of a bowstring arch bridge. Influence matrix was used to optimize the result of the method of rigid cables, and a satisfied result was gotten.3. Influence matrix was used to obtain the initial tension of cables at construction stage, and the result was verified by finite element model. It came to the conclusion that influence matrix could calculate the initial tension of cables with high precision and reduce the amount of calculation.4. The genetic algorithm was combined with BP Neural Network, and the GA-BP Neural Network was used to identify the main parameters which affecting the arch rib geometric alignment when pouring arch rib concrete.5. The GA-BP Neural Network was used to identify the tension of the cables with the absorber considered. In order to improve the calculation accuracy, a specific finite element model was built to identify the tension of the cables.