Extradosed Cable-stayed Bridge Optimization Design Research Based On Engineering Example

The extradosed cable-stayed bridge, also known as part of the cable-stayed bridge, is arelatively new form of bridge structure. This type of bridge make up for the shortage oftraditional cable-stayed bridge and continuous beam bridge, can very good application inmedium and long span bridges, so it has good prospects for development. Because there aremany factors to consider in the design stage of the extradosed cable-stayed bridge, and cannot guarantee bridge structure design is optimal state, so the bridge optimization is of greatengineering significance. At present, the optimization design of low pylon cable-stayedbridge is mainly aims at the specific project, and the final optimization results applied to thespecific project.This paper is aimed at the Huai Hong New River2#bridge to research. Firstly discussedthe origin and development of the extradosed cable-stayed bridge, and the structurecharacteristics and design points, then according to the design data establish the finiteelement analysis model. To optimize the design Part of the structure parameters of thebridge the main structure parameters optimization of initial cable tension, no cable length ofthe girder and the height of the towers. By separately considering the various structuralparameters to optimization design, and contrastively analyze with the original design of thebridge into the stress state of bridge girder, finally get the optimal state of the bridge. Theprocess and results of this paper can be applied to the optimization design of the actualconstruction of the project, and for the future of low tower cable-stayed bridge optimizationdesign provides reference.