Studies On The Stability Of Thousand-Meter Scale Steel Box Girder Cable-Stayed Bridges

Various kinds of nonlinear factors of cable-stayed bridge are analyzed, with regard to these problems, the parametric design language in the general finite element software ANSYS is used to analyze of the drawing of the cable and model the construction process.The methods of calculating the first and second kind of stability problems are expatiated using the nonlinear finite element method. The computational principle, judgement criterion and method of stability and the simplification of constitutive relation are illustrated. The model of the stability computation and the computational process of the stability case of the thousand-meter scale steel box girder cable-stayed bridge are proposed.Based on a thousand-meter scale steel box girder cable-stayed bridge, which is on construction, the structural stability of the construction process under the construction design and control plan is analyzed. The computation results of the first kind of stability in the two kinds of construction plan are researched. The stability of the construction stages in which considered the geometric nonlinearity only is analyzed. And the influence on stability of cable sag effect is researched. The buckling configuration of the longest double cantilever stage, longest single cantilever stage and second term dead load stage are paid great attention to. For the construction control plan, geometric nonlinearity and material nonlinearity are both considered and the stability of construction stage is researched. The buckling configuration of the longest double cantilever stage and longest single cantilever stage are also paid great attention to. The influence on stability of the boundary nonlinearity which arises from the single direction force of the construction temporary bracket pivot in the construction process is analyzed.