| The cable takes on most part of load in construction stage as well as the actual use stage, It is one of the key parts of cable-stayed bridge. Rational cable force can guarantee the structure safety in construction and make the structure's internal force reasonable after construction. The key factors that influence its mechanics performance are the cable forces under dead loads and the preliminary cable forces. The methods of determining the cable tensions under ideal finish state and reasonable construction state are researched in this paper based on the JIASHAO Cable-Stayed Bridge. The main contents and achievements in this thesis are as follows:1. Static analysis method and optimization theory of cable force for cable-stayed bridges are reviewed, which provided theoretical foundation for the determination of cable tensions under ideal finish state and reasonable construction state.2. General methods of determining reasonable finished cable force for cable-stayed bridge are researched, the application scope and various methods characteristic are discussed.3. Establishes the optimized model of the cable forces of the cable-stayed bridges. Introduced with the step of the minimum energy of bending and influence matrix method determined the cable-stayed bridges reasonable finished cable force in detail, and obtains reasonable finished cable force with the minimum energy of bending and influence matrix method, then the result is compared. This has laid the foundation on the next step of determination construction cable forces, and has the instruction significance to the cable-stayed bridges construction.4. General methods of determining reasonable construction cable force for cable-stayed bridge are introduced, the various methods characteristic are summarized, a construction model of JIASHAO cable-stayed bridge is established, using the nonlinear analysis system-NLABS. And obtains reasonable construction cable force with the stress-free status method. |
PDF Full Text Request