The Simulation Of The Construction Process And Geometry Control Of Composite Cable-Stayed Bridge

With the increase span of cable-stayed bridge, the construction process is also becoming more and more complex; construction control technology of cable-stayed bridge has become increasingly important.Based on the construction control of Jiangjin Bridge,this thesis Mainly include two aspects:construction process simulation and analysis and geometry control. Unstress Status Method is adopted to the construction control,which is also known as geometric control method. This method mainly control the unstress geometry size of each components of the whole cable-stayed bridge such as the unstress length of cable, unstress geometry of steel girder. The basic point is:as long as the unstress length and unstress curvature of each component in the cable-stayed bridge structure remain unchanged, after the bridge is completed the final status of internal forces and the displacement is the same, and is unrelated to the specific construction process of the bridge. This construction control method offer great convenience to the cable-stayed bridge construction, not only the quality of the project is guaranteed, but at the same time achieve more procedure of the cable-stayed bridge construction could be fulfilled. First of all, introduce the basic theories of Unstress Status Method, through the theoretical analysis we can draw the basic points of this method, and to know the characteristics and advantages of the Unstress Status Method;Then the thesis perform the simulation analysis of the Jiangjin bridge construction process and the related results obtained show that the processes and methods are safe and reasonable. Finally, the thesis discusses the relationship of three kinds of geometries (ultimate geometry,assembled geometry,unstress germetry) and introduces the theories of zero-initial-displacement method and tangent-initial-displacement method,which are adopted to get the assembled geometry and unstress germetry.The tensing process of the cable and the measuring geometry are analyzed,and the results show that the geometry control is effective.