The Stability Analysis Of Xinjiang Bridge Tower

In recent years, the number of various kinds of bridges is growing due to the increasing use of rivers and oceans, especially to the cable-stayed bridges. With the increase of the span of the cable-stayed bridge, the height of its main tower is also increasing. Therefore, the stability of its main tower is becoming more and more important. The research to the stability of main tower construction is more conducive to the build of higher main tower and greater span for cable-stayed bridge.This article discusses the problems of structural instability and the research methods about its stability. The development of structure eigenvalue buckling analysis and nonlinear buckling analysis is also introduced.Through the introduction of the finite element theory, the paper confirms the theoretical basis of ANSYS eigenvalue buckling analysis, and brings about several methods to calculate eigenvalue. In addition, the process of ANYSY eigenvalue buckling analysis is also introduced.It builds a 3-dimensional entity model of the main tower and makes some eigenvalue buckling analysis according to the situation of Xinjiang Bridge. In the calculation of the modeling, we find that the distinction is great when we use different modulus of elasticity. So, we can conclude that the elastic modulus has great impact on the critical load.In the presentation of procedure and process of nonlinear analysis, we determine the basis of nonlinear analysis through the eigenvalue buckling analysis of the main tower. Make the buckling load of eigenvalue buckling analysis as the applied loads of nonlinear analysis, by means of the analytical method of arc length, we can see that buckling load of nonlinear analysis is greater than the buckling load of eigenvalue buckling analysis.Compared to the method of eigenvalue buckling analysis, the nonlinear analysis is difficult, and the requirement of the computer is relatively high, especially for complex models. From the results of the two analytical methods and the actual force of the stay cables, we can see that safety factor of Xinjiang Bridge is high. To sum up, this paper not only provides some helpful reference for engineering design, but also gives some personal opinions about the problems to be solved in actual research.