Construction Control And Analysis Of Cable-Stayed Bridges

In this paper, construction control on long span bridges both domestic and abroad was reviewed and it's status quo was analyzed at first. Then the theory, method and contributing factor of bridge construction control were recommended. At last the analysis and calculation method of structure model were discussed in-details,some problems were taken into account, the function and use of software "ANSYS" were introduced in the bridge construction process.Aiming at main project of the building Xiaoxihu cable-stayed bridge with a low pylon, based on the existing theory and method of the bridge construction control theory, using the basic function of "ANSYS", farther exploitation of the software was done on concrete elasticity and creep calculating distinguishingly. A nonlinearity analysis theory was used to build the space model. The main beam, string pylon and abutment were simulated by the beam elements which considered the effect of shear. It was worthy of considering that using the geometric non-linear truss elements to simulate the stayed-cable, form traveler was modeled as structure elements and participate in stress analysis. The whole construction was divided into four stages: (1) the erection of form traveler; (2) placing the segmental concrete; (3) jacking the tendons; (4) tensioning the stay cables. The construction control system, consisting of structure analysis system, testing system, tollerence analysis system and prediction system were introduced. Analyzing this bridge as engineering example,the theory and calculation method of the bridge construction control can have some reference to the future construction. In the end, the existing problems were also presented in details, which shall be studied in the future.