Research On Stability Of Pylon Of Suspension Bridge

In the bridge system, suspension bridge is appreciated by the constructors because of its remarkable crossing attribute and low cost. As the core component for load-bearing, the mechanical property of the pylon therefore becomes the one of the most crucial factors in bridge designing. Especially with the tendency of taller pylon-body, thinner pylon column section and new-material using, the rigidity of the pylon is reducing, which hence raising the problem of the stability of the bridge. This article mainly focuses on the following sections:1.The common structures and loading features of pylons will be introduced, followed by the summary of the pylon stability from the relevant literature. After that, the reason of the instability of pylon will be analyzed through the finite element aspect with the criteria of stability given in the end.2.With the two kinds of stability calculation of the examples and the analysis about the mechanism of destructing compression bar stability, it is proved that we cannot merely consider the single nonlinear factor.3.The stability of the bridge pylon will be analyzed from the perspectives of bare-pylon and dead state. The main cable has a significant influence on the stability of the bridge pylon to enhance it by changing the instability direction.4.Through the ultimate bearing capacity analysis with the consideration of initial imperfections and binonlinear factors, it is concluded that the second kind safety factor of stability is 0.12-0.31 times of the first kind safety factor of stability, and the concrete of both pylon bottom is damaged by the pressure.5.The five major stability-influential factors, namely nonlinear factors, initial imperfections, limitation, pylon rigidity and static gust load, are analyzed statistically to quantificate their influential degree.