Technology Research Of Cable Replacement Of Single-tower And Single Cable Plane Concrete Cable-stayed Bridge

In the recent years, cable-stayed bridge has been greatly developed all over the world. In the past 50 years, about 300 cable-stayed bridges have been built in the whole world. owing to the imperfect cable protection technology, cable corrosion is unavoidable after the bridge served a few years. a great number of cable-stayed bridges home and aboard has faced or will face the similar problems, such as cable changing and cable tension adjusting. How to finish the cable replacement safely and availably becomes the problem that demand to solve urgently.The main objective of cable replacement design is to improve bridge geometry and internal forces of primary bridge by replacing cables. If failed to simulate the actual status of primary bridge in the design, which will result in the bridge geometry and cable forces differ desired value greatly after cable replacement work is finished. In this thesis, based on cable forces optimization theory, utilizing minimal remnant energy principle, the theory how to improve bridge shape and internal forces of primary bridge by replacing cables is founded. And in combination with cable replacement engineering of Chongqing Shimen Bridge , based on the bridge elevation and cable forces measured before cable replacement started , using finite element software MIDAS build analysis modeling , by means of cable forces adjustment and so on to make the cable forces of modeling approach the cable forces measured before cable replacement started , according to the scheme of design , aimed at cable replacement process , simulation analysis is done and get the calculated results . By model calculating, a detail analysis is made for the parameters after the cable being changed and the present statement of internal forces. Finally, construction techniques and crafts for cable replacement are summed up and discussed, and the author carries out a detailed analysis of the engineering major and difficulty are and propose solutions, as well as the construction of key technical, technological applications.