The Application And Experiment Of Circular Prestressing System For Pylon

With the development of technology and the increasing requirement of traffic, bridge class will be higher and bridge span is longer. Cable-stayed bridge is a main style of long span bridge, and is widely applied in practice more and more. Zhong-Ba Brdige across Jin-Sha-River in Sichuan YiBin is taken as an engineering example in this thesis. On basis of collecting information about the application of prestressing system to anchorage zone of pylon for cable-stayed bridge, theoretical analysis and full-scale mode test are carried out to research the application of circular prestressing system which radius is small and prestressing force is strong. Firstly, the domestic researches, which have been reported, are introduced. Then the characteristic of the system in estimation of prestressing losses is analyzed by theoretical method, and the reasons that the elimination of tendon is large and test results are not consistent are pointed. Using FEM software ANSYS, anchorage zone of pylon are analyzed. The analysis result is compared with that of full-scale model test.In this thesis, theoretical analysis and full-scale mode test are carried out to research the application of circular prestressing system. Some general conclusions obtained can be regarded as the reference of related codes. The research is useful in the structural design and construction practices.