Technology Research On Cable Replacement Of Cable-stayed Bridge

With the maturity of the cable-stayed bridge construction technology, the span of the structural is becoming larger,flexibility is also constantly increasing, combined with a variety of external factors on the cable-stayed bridge making cable corrosed,the life and safety of structural and performance are have been affected.For the cable-stayed bridge built in the past, the destruction and the harm to the cable-stayed bridge can only be changed by replacing the cables.Recently,research on cable-stayed bridge for changing cables is becoming a hot issue in the engineering field.The main method to eliminate the inherent security risks is replacing the corrosive cables on cable-stayed bridge,but also be the one way to improvethe linear and Internal forces.For cable changing project should choose a reasonable objective optimization condition,with minimum bending energy as an example,the method by controlling the post-structuralist produced for cable bending strain energy minimization as the goal to determine a reasonable optimization of cable force,the cable tension control can be obtained through the influence matrix,in this paper, a cable-stayed bridge in Chongqing as an example,by the optimization of the bridge to set a reasonable goal,use the cable influence matrix to calculate the new cable tension.To simulate the construction process,and contrast the changes in elevation and internal forces during the construction process,and through a large number of examples of cable-stayed bridge for cable replacement analysis,the author summarized overall construction process in replacement of cable-stayed,also introduce and discuss the construction techniques,gave the solutions on the major and difficult in the engineering,based on the cable replacement engineering of Chongqing Shimen Bridge,shows that the claims process for the development is reasonable and feasible,can provide a frame of reference to the similar engineering project.