Construction Control Analysis Of Long-Span Cable-Stayed Bridges

According to the design theory of the cable-stayed bridge and to the feature of the cantilever construction, emulation analysis for construction sequences of cable-stayed bridge is presented. A forward-analysis method is introduced, in which the actual construction process is considered. The influences of geometric nonlinearity are taken into account.Using Minimum Bending Energy Method, an optimum completion state is gained. It is shown that cable force in the completion stage and deflection of the girder surface in the completion stage.Nonlinear factors, including finite deflection, column-beam effect and cable sag, are taken into account, and their influences on cable-stayed bridge construction control analysis are studied in detail at different phase respectively. By comparing with the girder deflection which caused by nonlinear influence of three geometric nonlinearities, differences of these factors can be presented.Finally, the paper is concerned with the determination of the initial cable force of cable-stayed bridge. Forward-analysis method is recommended. It is shown that the method is more comprehensive, easier and more accurate than previous methods. With the initial cable force determined by present method, the final cable force and shape can be determined easily. Consequently, the workload of construction control, human, material and financial resources are reduced substantially.