Static Stability Analysis Of Concrete Cable-stayed Bridge

In the cantilever construction and service stage, the girder and pylon of the long-span cable-stayed bridge have high compressive force, so the whole static stability of the bridge should be considered. In this paper, it takes the Chongqing Diwei Yangtze River Bridge as an example to analyze the stability of long-span cable-stayed bridge by the general finite element software. First, it introduce the stability analysis methods of cable-stayed bridge. And then the stability of longest double cantilever, single cantilever and service states of this concrete cable-stayed bridge are analyzed. Three analysis cases are used. They are eigenvalue buckling analysis, nonlinear analysis which considers only geometric nonlinearity and which both geometric and material nonlinearities. The main contents are as follows:1. The finite element modeling of cable-stayed bridge girder is discussed, and the stability analysis results of several different finite element models are compared, then the property of them are obtained. A method which uses equivalent rigidity to simulate the lateral connection of double-girder model is proposed. Its result is similar to that of the model which uses solid element.2. The results of eigenvalue buckling analysis, nonlinear analysis which considers only geometric nonlinearity and which both geometric and material nonlinearities of stability analysis are compared. The conclusion that the effect of material nonlinearity is greater than that of geometric nonlinearity is drawn.3. The structural parameters, load parameters, construction factors which affect the ultimate capacity of this bridge are analyzed and can be used as the reference of design and construction.