Study On The Interaction And Allocation Between Cable And Prestressed Reinforcement

The extra-dosed cable-stayed bridge is a structure between the girder bridge and the conventional cable-stayed bridge, the cables only play a supporting role when the load on the beam, so the cable configuration is less than ordinary cable-stayed bridge. It is also because of the help of cable support, prestressed configuration and height of girder is small. The cable tension in the construction will inevitably have influence on the anchored prestressed tendons. The tension of pre-stressing steel also affect anchored cable. The mutual influence between the two has play a decisive role of the significance of the analysis and control of the construction process of the bridge. Low tower cable-stayed bridge live load distribution depends on the main beam(stiffness by prestressed tendons representative) and the cable stiffness ratio, the amount of the configuration of the structure stiffness contribution ratio will be higher, the more will live load sharing. For cable and girder of prestressed reinforcement ratios, different designers in practice according to the design of their own experience will have different results, although the structure can use, but the design is still a reasonable economic legacy.This paper tray River Bridge south of the background, with the finite element software MIDAS CIVIL above issues surrounding research. First, through the tensile force of cable and girder prestressed reinforcement grading change value, summarize the structure internal force, deflection and the stress change rule analysis of cable force and pre-stress, their influence on the structure sensitivity. Secondly, in the finite element software through the refinement of the construction stage, to study the effect of cantilever construction stage, in the process of side span closure, closure of cable and girder in the stage of prestressed tension between each other, the cable tensioning of cable reinforced others will have different effects in different parts of different stages are. Finally, taking cable reinforcement total cost as the objective function, in order to live load ratio of cable and beam as the two respective configuration on behalf of quantity, allocation of cable and girder of prestressed tendon is optimized, so that the total cost of cable and prestressed reinforcement at. The results of this study can help the designer to design the future of the extra-dosed cable-stayed bridge in operation stage live load internal force analysis and control to determine the distribution and construction process.