Analysis of Stability Coefficient for Super Long Span Cable-stayed Bridge

摘要

With the increase of the cable-stayed bridge' span length, there will appear super high towers, super long cables, and super flexible stiffening girder structures. It is necessary to research on the ultimate load-carrying capacity and stability of the structures. Based on the design project of Sutong Bridge which is the longest span with double cable plane and double tower cable-stayed bridge, the spatial model of the Sutong Bridge was established by the MIDAS software. Taking geometric non-linear stability and geometric-material non-linear stability into consideration respectively, analysis of the ultimate load-bearing capacity was completed. The results show that non-linear has a great impact on its ultimate bearing capacity. In the actual design construction, it is necessary to consider the structural stability factor's reduction caused by the non-linear stability, especially the dual non-linear stability.