Study On The Construction Control Numrical Simulation Method Of Long-Span Concrete Cable-Stayed Bridge

Segmental construction method and construction order have a direct impact on the geometric alignment and internal forces of each construction stage as well as the bridge's completion state, this means that the changes of construction method and construction sequence can change or adjust the geometric alignment and internal forces of a structure; meanwhile, in each of the different construction stage, or have different forms of a structure, or stress system has been converted, or construction loads have been changed, therefore, do the numerical simulation analysis of every stage's geometric alignment and internal forces of a bridge in accordance with the actual construction form is the basic requirement in segmental construction control.This thesis under the background of describe the development of domestic and abroad cable-stayed bridge, the development course and methods of cable-stayed bridge's construction control, according to the structure of the cable-stayed bridge's design principle as well as the characteristics of the cantilever construction method, for a long-span concrete cable-stayed bridge, using structural engineering analysis software MIDAS / Civil, set up construction process numerical simulation model according to forward analysis method and backward analysis method. The characteristics of concrete shrinkage and creep, cable sag effect were accounted into the models.According to the results from the two different numerical simulation models, did comparison with the deflection and internal forces of main beam, the offset of tower, the internal forces and stress of stayed-cable in the same construction state, obtained the same points and the differences, analyzed differences between the two analysis model and explored the reasons arising from these differences.